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Pinker argues that all three dogmas were held onto for an extended period even in the face of evidence because they were seen as desirable in the sense that if any human trait is purely conditioned by culture, any undesired trait such as crime or aggression may be engineered away by purely cultural political means.

Pinker focuses on reasons he assumes were responsible for unduly repressing evidence to the contrary, notably the fear of imagined or projected political or ideological consequences.

It is important to note that the term heritability refers only to the degree of genetic variation between people on a trait.

It does not refer to the degree to which a trait of a particular individual is due to environmental or genetic factors.

The traits of an individual are always a complex interweaving of both. In contrast, the "heritability index" statistically quantifies the extent to which variation between individuals on a trait is due to variation in the genes those individuals carry.

In animals where breeding and environments can be controlled experimentally, heritability can be determined relatively easily.

Such experiments would be unethical for human research. This problem can be overcome by finding existing populations of humans that reflect the experimental setting the researcher wishes to create.

One way to determine the contribution of genes and environment to a trait is to study twins. The twins share identical genes, but different family environments.

Twins reared apart are not assigned at random to foster or adoptive parents. In another kind of twin study, identical twins reared together who share family environment and genes are compared to fraternal twins reared together who also share family environment but only share half their genes.

Another condition that permits the disassociation of genes and environment is adoption. In one kind of adoption study , biological siblings reared together who share the same family environment and half their genes are compared to adoptive siblings who share their family environment but none of their genes.

In many cases, it has been found that genes make a substantial contribution, including psychological traits such as intelligence and personality.

Examples of low, medium, and high heritability traits include:. Twin and adoption studies have their methodological limits.

For example, both are limited to the range of environments and genes which they sample. Almost all of these studies are conducted in Western, first-world countries, and therefore cannot be extrapolated globally to include poorer, non-western populations.

Additionally, both types of studies depend on particular assumptions, such as the equal environments assumption in the case of twin studies, and the lack of pre-adoptive effects in the case of adoption studies.

Since the definition of "nature" in this context is tied to "heritability", the definition of "nurture" has necessarily become very wide, including any type of causality that is not heritable.

The term has thus moved away from its original connotation of "cultural influences" to include all effects of the environment, including; indeed, a substantial source of environmental input to human nature may arise from stochastic variations in prenatal development and is thus in no sense of the term "cultural".

Many properties of the brain are genetically organized, and don't depend on information coming in from the senses.

The interactions of genes with environment, called gene—environment interactions , are another component of the nature—nurture debate. A classic example of gene—environment interaction is the ability of a diet low in the amino acid phenylalanine to partially suppress the genetic disease phenylketonuria.

Yet another complication to the nature—nurture debate is the existence of gene—environment correlations. These correlations indicate that individuals with certain genotypes are more likely to find themselves in certain environments.

Thus, it appears that genes can shape the selection or creation of environments. Even using experiments like those described above, it can be very difficult to determine convincingly the relative contribution of genes and environment.

Heritability refers to the origins of differences between people. Individual development, even of highly heritable traits, such as eye color, depends on a range of environmental factors, from the other genes in the organism, to physical variables such as temperature, oxygen levels etc.

The variability of trait can be meaningfully spoken of as being due in certain proportions to genetic differences "nature" , or environments "nurture".

For highly penetrant Mendelian genetic disorders such as Huntington's disease virtually all the incidence of the disease is due to genetic differences.

Huntington's animal models live much longer or shorter lives depending on how they are cared for. At the other extreme, traits such as native language are environmentally determined: linguists have found that any child if capable of learning a language at all can learn any human language with equal facility.

At a molecular level, genes interact with signals from other genes and from the environment. While there are many thousands of single-gene-locus traits, so-called complex traits are due to the additive effects of many often hundreds of small gene effects.

A good example of this is height, where variance appears to be spread across many hundreds of loci. Extreme genetic or environmental conditions can predominate in rare circumstances—if a child is born mute due to a genetic mutation , it will not learn to speak any language regardless of the environment; similarly, someone who is practically certain to eventually develop Huntington's disease according to their genotype may die in an unrelated accident an environmental event long before the disease will manifest itself.

Steven Pinker likewise described several examples: [40] [41]. But traits that reflect the underlying talents and temperaments—how proficient with language a person is, how religious, how liberal or conservative—are partially heritable.

When traits are determined by a complex interaction of genotype and environment it is possible to measure the heritability of a trait within a population.

However, many non-scientists who encounter a report of a trait having a certain percentage heritability imagine non-interactional, additive contributions of genes and environment to the trait.

As an analogy, some laypeople may think of the degree of a trait being made up of two "buckets," genes and environment, each able to hold a certain capacity of the trait.

But even for intermediate heritabilities, a trait is always shaped by both genetic dispositions and the environments in which people develop, merely with greater and lesser plasticities associated with these heritability measures.

Heritability measures always refer to the degree of variation between individuals in a population. That is, as these statistics cannot be applied at the level of the individual, it would be incorrect to say that while the heritability index of personality is about 0.

To help to understand this, imagine that all humans were genetic clones. The heritability index for all traits would be zero all variability between clonal individuals must be due to environmental factors.

And, contrary to erroneous interpretations of the heritability index, as societies become more egalitarian everyone has more similar experiences the heritability index goes up as environments become more similar, variability between individuals is due more to genetic factors.

One should also take into account the fact that the variables of heritability and environmentality are not precise and vary within a chosen population and across cultures.

It would be more accurate to state that the degree of heritability and environmentality is measured in its reference to a particular phenotype in a chosen group of a population in a given period of time.

The accuracy of the calculations is further hindered by the number of coefficients taken into consideration, age being one such variable.

The display of the influence of heritability and environmentality differs drastically across age groups: the older the studied age is, the more noticeable the heritability factor becomes, the younger the test subjects are, the more likely it is to show signs of strong influence of the environmental factors.

A study conducted by T. Bouchard, Jr. The results shown have been important evidence against the importance of environment when determining, happiness, for example.

In the Minnesota study of twins reared apart, it was actually found that there was higher correlation for monozygotic twins reared apart 0.

Also, highlighting the importance of genes, these correlations found much higher correlation among monozygotic than dizygotic twins that had a correlation of 0.

Some have pointed out that environmental inputs affect the expression of genes. The social pre-wiring hypothesis informally known as " wired to be social " refers to the ontogeny of social interaction.

The theory questions whether there is a propensity to socially oriented action already present before birth. Research in the theory concludes that newborns are born into the world with a unique genetic wiring to be social.

Circumstantial evidence supporting the social pre-wiring hypothesis can be revealed when examining newborns' behavior. Newborns, not even hours after birth, have been found to display a preparedness for social interaction.

This preparedness is expressed in ways such as their imitation of facial gestures. This observed behavior cannot be contributed to any current form of socialization or social construction.

Rather, newborns most likely inherit to some extent social behavior and identity through genetics. Principal evidence of this theory is uncovered by examining twin pregnancies.

The main argument is, if there are social behaviors that are inherited and developed before birth, then one should expect twin foetuses to engage in some form of social interaction before they are born.

Thus, ten foetuses were analyzed over a period of time using ultrasound techniques. Using kinematic analysis, the results of the experiment were that the twin foetuses would interact with each other for longer periods and more often as the pregnancies went on.

Researchers were able to conclude that the performance of movements between the co-twins were not accidental but specifically aimed. The social pre-wiring hypothesis was proven correct: [43].

The central advance of this study is the demonstration that ' social actions ' are already performed in the second trimester of gestation. Starting from the 14th week of gestation twin foetuses plan and execute movements specifically aimed at the co-twin.

These findings force us to predate the emergence of social behavior : when the context enables it, as in the case of twin foetuses, other-directed actions are not only possible but predominant over self-directed actions.

Traits may be considered to be adaptations such as the umbilical cord , byproducts of adaptations the belly button or due to random variation convex or concave belly button shape.

For example, the rewarding sweet taste of sugar and the pain of bodily injury are obligate psychological adaptations—typical environmental variability during development does not much affect their operation.

On the other hand, facultative adaptations are somewhat like "if-then" statements. The attachment style of adults, for example, a "secure attachment style," the propensity to develop close, trusting bonds with others is proposed to be conditional on whether an individual's early childhood caregivers could be trusted to provide reliable assistance and attention.

An example of a facultative physiological adaptation is tanning of skin on exposure to sunlight to prevent skin damage. Facultative social adaptation have also been proposed.

For example, whether a society is warlike or peaceful has been proposed to be conditional on how much collective threat that society is experiencing [47].

Quantitative studies of heritable traits throw light on the question. Developmental genetic analysis examines the effects of genes over the course of a human lifespan.

Subsequent developmental genetic analyses found that variance attributable to additive environmental effects is less apparent in older individuals, with estimated heritability of IQ increasing in adulthood.

Multivariate genetic analysis examines the genetic contribution to several traits that vary together. For example, multivariate genetic analysis has demonstrated that the genetic determinants of all specific cognitive abilities e.

Similarly, multivariate genetic analysis has found that genes that affect scholastic achievement completely overlap with the genes that affect cognitive ability.

Extremes analysis examines the link between normal and pathological traits. For example, it is hypothesized that a given behavioral disorder may represent an extreme of a continuous distribution of a normal behavior and hence an extreme of a continuous distribution of genetic and environmental variation.

Depression, phobias, and reading disabilities have been examined in this context. For a few highly heritable traits, studies have identified loci associated with variance in that trait, for instance in some individuals with schizophrenia.

Through studies of identical twins separated at birth, one-third of their creative thinking abilities come from genetics and two-thirds come from learning.

Evidence from behavioral genetic research suggests that family environmental factors may have an effect upon childhood IQ , accounting for up to a quarter of the variance.

The American Psychological Association 's report " Intelligence: Knowns and Unknowns " states that there is no doubt that normal child development requires a certain minimum level of responsible care.

Here, environment is playing a role in what is believed to be fully genetic intelligence but it was found that severely deprived, neglectful, or abusive environments have highly negative effects on many aspects of children's intellect development.

Beyond that minimum, however, the role of family experience is in serious dispute. On the other hand, by late adolescence this correlation disappears, such that adoptive siblings no longer have similar IQ scores.

Moreover, adoption studies indicate that, by adulthood, adoptive siblings are no more similar in IQ than strangers IQ correlation near zero , while full siblings show an IQ correlation of 0.

Twin studies reinforce this pattern: monozygotic identical twins raised separately are highly similar in IQ 0. Personality is a frequently cited example of a heritable trait that has been studied in twins and adoptees using behavioral genetic study designs.

The close genetic relationship between positive personality traits and, for example, our happiness traits are the mirror images of comorbidity in psychopathology.

These personality factors were consistent across cultures, and many studies have also tested the heritability of these traits.

Identical twins reared apart are far more similar in personality than randomly selected pairs of people. Likewise, identical twins are more similar than fraternal twins.

According to this notion, everything that we are and all of our knowledge is determined by our experience. Empiricists take the position that all or most behaviors and characteristics result from learning.

Behaviorism is a good example of a theory rooted in empiricism. The behaviorists believe that all actions and behaviors are the results of conditioning.

Theorists such as John B. Watson believed that people could be trained to do and become anything, regardless of their genetic background.

For example, when a person achieves tremendous academic success, did they do so because they are genetically predisposed to be successful or is it a result of an enriched environment?

If a man abuses his wife and kids, is it because he was born with violent tendencies or is it something he learned by observing his own parent's behavior?

A few examples of biologically determined characteristics nature include certain genetic diseases, eye color, hair color, and skin color.

Other things like life expectancy and height have a strong biological component, but they are also influenced by environmental factors and lifestyle.

An example of a nativist theory within psychology is Chomsky's concept of a language acquisition device or LAD.

Some characteristics are tied to environmental influences. How a person behaves can be linked to influences such as parenting styles and learned experiences.

For example, a child might learn through observation and reinforcement to say 'please' and 'thank you. One example of an empiricist theory within psychology is Albert Bandura's social learning theory.

According to the theory, people learn by observing the behavior of others. In his famous Bobo doll experiment , Bandura demonstrated that children could learn aggressive behaviors simply by observing another person acting aggressively.

Even today, research in psychology often tends to emphasize one influence over the other. In biopsychology , for example, researchers conduct studies exploring how neurotransmitters influence behavior, which emphasizes the nature side of the debate.

In social psychology , researchers might conduct studies looking at how things such as peer pressure and social media influence behaviors, stressing the importance of nurture.

What researchers do know is that the interaction between heredity and environment is often the most important factor of all. Perfect pitch is the ability to detect the pitch of a musical tone without any reference.

Researchers have found that this ability tends to run in families and believe that it might be tied to a single gene. Simply Psychology.

Bandura, A. Ross, D. Transmission of aggression through the imitation of aggressive models. Attachment and loss: Vol.

New York: Basic Books. Galton, F. Inquiries into human faculty and its development. London: J. Gottlieb, G. Probabilistic epigenesis.

Developmental Science, 10 , 1— Haworth, C. Twins Early Development Study TEDS : a genetically sensitive investigation of cognitive and behavioral development from childhood to young adulthood.

Twin Research and Human Genetics, 16 1 , By the 19th century, the predominant perspective was contrary to that of Locke's, tending to focus on " instinct.

The question of "innate ideas" or "instincts" were of some importance in the discussion of free will in moral philosophy. In 18th-century philosophy, this was cast in terms of "innate ideas" establishing the presence of a universal virtue, prerequisite for objective morals.

In the 20th century, this argument was in a way inverted, since some philosophers J. Mackie now argued that the evolutionary origins of human behavioral traits forces us to concede that there is no foundation for ethics, while others Thomas Nagel treated ethics as a field of cognitively valid statements in complete isolation from evolutionary considerations.

In the early 20th century, there was an increased interest in the role of the environment, as a reaction to the strong focus on pure heredity in the wake of the triumphal success of Darwin's theory of evolution.

Franz Boas 's The Mind of Primitive Man established a program that would dominate American anthropology for the next 15 years.

In this study, he established that in any given population , biology, language , material , and symbolic culture , are autonomous ; that each is an equally important dimension of human nature, but that no one of these dimensions is reducible to another.

John B. Watson in the s and s established the school of purist behaviorism that would become dominant over the following decades.

Watson is often said to have been convinced of the complete dominance of cultural influence over anything that heredity might contribute.

This is based on the following quote which is frequently repeated without context, as the last sentence is frequently omitted, leading to confusion about Watson's position: [22].

Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select — doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.

I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years.

During the s to s, Ashley Montagu was a notable proponent of this purist form of behaviorism which allowed no contribution from heredity whatsoever: [23].

Man is man because he has no instincts, because everything he is and has become he has learned, acquired, from his culture In , Calvin Hall suggested that the dichotomy opposing nature to nurture is ultimately fruitless.

In African Genesis and The Territorial Imperative , Robert Ardrey argues for innate attributes of human nature, especially concerning territoriality.

Desmond Morris in The Naked Ape expresses similar views. Organised opposition to Montagu's kind of purist "blank-slatism" began to pick up in the s, notably led by E.

Wilson On Human Nature , The tool of twin studies was developed as a research design intended to exclude all confounders based on inherited behavioral traits.

Twin studies established that there was, in many cases, a significant heritable component. Rather, it was purist behaviorism that was gradually replaced by the now-predominant view that both kinds of factors usually contribute to a given trait, anecdotally phrased by Donald Hebb as an answer to the question "which, nature or nurture, contributes more to personality?

In a comparable avenue of research, anthropologist Donald Brown in the s surveyed hundreds of anthropological studies from around the world and collected a set of cultural universals.

He identified approximately such features, coming to the conclusion there is indeed a "universal human nature", and that these features point to what that universal human nature is.

At the height of the controversy, during the s to s, the debate was highly ideologised. If biological determinism is a weapon in the struggle between classes, then the universities are weapons factories, and their teaching and research faculties are the engineers, designers, and production workers.

The authors deny this, requesting that evolutionary inclinations be discarded in ethical and political discussions regardless of whether they exist or not.

Heritability studies became much easier to perform, and hence much more numerous, with the advances of genetic studies during the s.

By the late s, an overwhelming amount of evidence had accumulated that amounts to a refutation of the extreme forms of "blank-slatism" advocated by Watson or Montagu.

This revised state of affairs was summarized in books aimed at a popular audience from the late s. The book became a best-seller, and was instrumental in bringing to the attention of a wider public the paradigm shift away from the behaviourist purism of the s to s that had taken place over the preceding decades.

Pinker portrays the adherence to pure blank-slatism as an ideological dogma linked to two other dogmas found in the dominant view of human nature in the 20th century:.

Pinker argues that all three dogmas were held onto for an extended period even in the face of evidence because they were seen as desirable in the sense that if any human trait is purely conditioned by culture, any undesired trait such as crime or aggression may be engineered away by purely cultural political means.

Pinker focuses on reasons he assumes were responsible for unduly repressing evidence to the contrary, notably the fear of imagined or projected political or ideological consequences.

It is important to note that the term heritability refers only to the degree of genetic variation between people on a trait. It does not refer to the degree to which a trait of a particular individual is due to environmental or genetic factors.

The traits of an individual are always a complex interweaving of both. In contrast, the "heritability index" statistically quantifies the extent to which variation between individuals on a trait is due to variation in the genes those individuals carry.

In animals where breeding and environments can be controlled experimentally, heritability can be determined relatively easily.

Such experiments would be unethical for human research. This problem can be overcome by finding existing populations of humans that reflect the experimental setting the researcher wishes to create.

One way to determine the contribution of genes and environment to a trait is to study twins. The twins share identical genes, but different family environments.

Twins reared apart are not assigned at random to foster or adoptive parents. In another kind of twin study, identical twins reared together who share family environment and genes are compared to fraternal twins reared together who also share family environment but only share half their genes.

Another condition that permits the disassociation of genes and environment is adoption. In one kind of adoption study , biological siblings reared together who share the same family environment and half their genes are compared to adoptive siblings who share their family environment but none of their genes.

In many cases, it has been found that genes make a substantial contribution, including psychological traits such as intelligence and personality.

Examples of low, medium, and high heritability traits include:. Twin and adoption studies have their methodological limits. For example, both are limited to the range of environments and genes which they sample.

Almost all of these studies are conducted in Western, first-world countries, and therefore cannot be extrapolated globally to include poorer, non-western populations.

Additionally, both types of studies depend on particular assumptions, such as the equal environments assumption in the case of twin studies, and the lack of pre-adoptive effects in the case of adoption studies.

Since the definition of "nature" in this context is tied to "heritability", the definition of "nurture" has necessarily become very wide, including any type of causality that is not heritable.

The term has thus moved away from its original connotation of "cultural influences" to include all effects of the environment, including; indeed, a substantial source of environmental input to human nature may arise from stochastic variations in prenatal development and is thus in no sense of the term "cultural".

Many properties of the brain are genetically organized, and don't depend on information coming in from the senses.

The interactions of genes with environment, called gene—environment interactions , are another component of the nature—nurture debate.

A classic example of gene—environment interaction is the ability of a diet low in the amino acid phenylalanine to partially suppress the genetic disease phenylketonuria.

Yet another complication to the nature—nurture debate is the existence of gene—environment correlations.

These correlations indicate that individuals with certain genotypes are more likely to find themselves in certain environments. Thus, it appears that genes can shape the selection or creation of environments.

Even using experiments like those described above, it can be very difficult to determine convincingly the relative contribution of genes and environment.

Heritability refers to the origins of differences between people. Individual development, even of highly heritable traits, such as eye color, depends on a range of environmental factors, from the other genes in the organism, to physical variables such as temperature, oxygen levels etc.

The variability of trait can be meaningfully spoken of as being due in certain proportions to genetic differences "nature" , or environments "nurture".

For highly penetrant Mendelian genetic disorders such as Huntington's disease virtually all the incidence of the disease is due to genetic differences.

Huntington's animal models live much longer or shorter lives depending on how they are cared for. At the other extreme, traits such as native language are environmentally determined: linguists have found that any child if capable of learning a language at all can learn any human language with equal facility.

At a molecular level, genes interact with signals from other genes and from the environment. While there are many thousands of single-gene-locus traits, so-called complex traits are due to the additive effects of many often hundreds of small gene effects.

A good example of this is height, where variance appears to be spread across many hundreds of loci. Extreme genetic or environmental conditions can predominate in rare circumstances—if a child is born mute due to a genetic mutation , it will not learn to speak any language regardless of the environment; similarly, someone who is practically certain to eventually develop Huntington's disease according to their genotype may die in an unrelated accident an environmental event long before the disease will manifest itself.

Steven Pinker likewise described several examples: [40] [41]. But traits that reflect the underlying talents and temperaments—how proficient with language a person is, how religious, how liberal or conservative—are partially heritable.

When traits are determined by a complex interaction of genotype and environment it is possible to measure the heritability of a trait within a population.

However, many non-scientists who encounter a report of a trait having a certain percentage heritability imagine non-interactional, additive contributions of genes and environment to the trait.

As an analogy, some laypeople may think of the degree of a trait being made up of two "buckets," genes and environment, each able to hold a certain capacity of the trait.

But even for intermediate heritabilities, a trait is always shaped by both genetic dispositions and the environments in which people develop, merely with greater and lesser plasticities associated with these heritability measures.

Heritability measures always refer to the degree of variation between individuals in a population. That is, as these statistics cannot be applied at the level of the individual, it would be incorrect to say that while the heritability index of personality is about 0.

To help to understand this, imagine that all humans were genetic clones. The heritability index for all traits would be zero all variability between clonal individuals must be due to environmental factors.

And, contrary to erroneous interpretations of the heritability index, as societies become more egalitarian everyone has more similar experiences the heritability index goes up as environments become more similar, variability between individuals is due more to genetic factors.

One should also take into account the fact that the variables of heritability and environmentality are not precise and vary within a chosen population and across cultures.

It would be more accurate to state that the degree of heritability and environmentality is measured in its reference to a particular phenotype in a chosen group of a population in a given period of time.

The accuracy of the calculations is further hindered by the number of coefficients taken into consideration, age being one such variable.

The display of the influence of heritability and environmentality differs drastically across age groups: the older the studied age is, the more noticeable the heritability factor becomes, the younger the test subjects are, the more likely it is to show signs of strong influence of the environmental factors.

A study conducted by T. Bouchard, Jr. The results shown have been important evidence against the importance of environment when determining, happiness, for example.

In the Minnesota study of twins reared apart, it was actually found that there was higher correlation for monozygotic twins reared apart 0. Also, highlighting the importance of genes, these correlations found much higher correlation among monozygotic than dizygotic twins that had a correlation of 0.

Some have pointed out that environmental inputs affect the expression of genes. The social pre-wiring hypothesis informally known as " wired to be social " refers to the ontogeny of social interaction.

The theory questions whether there is a propensity to socially oriented action already present before birth. Research in the theory concludes that newborns are born into the world with a unique genetic wiring to be social.

Circumstantial evidence supporting the social pre-wiring hypothesis can be revealed when examining newborns' behavior. Newborns, not even hours after birth, have been found to display a preparedness for social interaction.

This preparedness is expressed in ways such as their imitation of facial gestures. This observed behavior cannot be contributed to any current form of socialization or social construction.

Rather, newborns most likely inherit to some extent social behavior and identity through genetics. Principal evidence of this theory is uncovered by examining twin pregnancies.

The main argument is, if there are social behaviors that are inherited and developed before birth, then one should expect twin foetuses to engage in some form of social interaction before they are born.

Thus, ten foetuses were analyzed over a period of time using ultrasound techniques. Using kinematic analysis, the results of the experiment were that the twin foetuses would interact with each other for longer periods and more often as the pregnancies went on.

Researchers were able to conclude that the performance of movements between the co-twins were not accidental but specifically aimed. The social pre-wiring hypothesis was proven correct: [43].

The central advance of this study is the demonstration that ' social actions ' are already performed in the second trimester of gestation.

Starting from the 14th week of gestation twin foetuses plan and execute movements specifically aimed at the co-twin. These findings force us to predate the emergence of social behavior : when the context enables it, as in the case of twin foetuses, other-directed actions are not only possible but predominant over self-directed actions.

Traits may be considered to be adaptations such as the umbilical cord , byproducts of adaptations the belly button or due to random variation convex or concave belly button shape.

For example, the rewarding sweet taste of sugar and the pain of bodily injury are obligate psychological adaptations—typical environmental variability during development does not much affect their operation.

On the other hand, facultative adaptations are somewhat like "if-then" statements. The attachment style of adults, for example, a "secure attachment style," the propensity to develop close, trusting bonds with others is proposed to be conditional on whether an individual's early childhood caregivers could be trusted to provide reliable assistance and attention.

An example of a facultative physiological adaptation is tanning of skin on exposure to sunlight to prevent skin damage.

Facultative social adaptation have also been proposed. For example, whether a society is warlike or peaceful has been proposed to be conditional on how much collective threat that society is experiencing [47].

Quantitative studies of heritable traits throw light on the question.

This is based on the following quote which is frequently repeated without context, as the last sentence is frequently omitted, leading to confusion about Watson's position: [22].

Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select — doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.

I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years.

During the s to s, Ashley Montagu was a notable proponent of this purist form of behaviorism which allowed no contribution from heredity whatsoever: [23].

Man is man because he has no instincts, because everything he is and has become he has learned, acquired, from his culture In , Calvin Hall suggested that the dichotomy opposing nature to nurture is ultimately fruitless.

In African Genesis and The Territorial Imperative , Robert Ardrey argues for innate attributes of human nature, especially concerning territoriality.

Desmond Morris in The Naked Ape expresses similar views. Organised opposition to Montagu's kind of purist "blank-slatism" began to pick up in the s, notably led by E.

Wilson On Human Nature , The tool of twin studies was developed as a research design intended to exclude all confounders based on inherited behavioral traits.

Twin studies established that there was, in many cases, a significant heritable component. Rather, it was purist behaviorism that was gradually replaced by the now-predominant view that both kinds of factors usually contribute to a given trait, anecdotally phrased by Donald Hebb as an answer to the question "which, nature or nurture, contributes more to personality?

In a comparable avenue of research, anthropologist Donald Brown in the s surveyed hundreds of anthropological studies from around the world and collected a set of cultural universals.

He identified approximately such features, coming to the conclusion there is indeed a "universal human nature", and that these features point to what that universal human nature is.

At the height of the controversy, during the s to s, the debate was highly ideologised. If biological determinism is a weapon in the struggle between classes, then the universities are weapons factories, and their teaching and research faculties are the engineers, designers, and production workers.

The authors deny this, requesting that evolutionary inclinations be discarded in ethical and political discussions regardless of whether they exist or not.

Heritability studies became much easier to perform, and hence much more numerous, with the advances of genetic studies during the s.

By the late s, an overwhelming amount of evidence had accumulated that amounts to a refutation of the extreme forms of "blank-slatism" advocated by Watson or Montagu.

This revised state of affairs was summarized in books aimed at a popular audience from the late s.

The book became a best-seller, and was instrumental in bringing to the attention of a wider public the paradigm shift away from the behaviourist purism of the s to s that had taken place over the preceding decades.

Pinker portrays the adherence to pure blank-slatism as an ideological dogma linked to two other dogmas found in the dominant view of human nature in the 20th century:.

Pinker argues that all three dogmas were held onto for an extended period even in the face of evidence because they were seen as desirable in the sense that if any human trait is purely conditioned by culture, any undesired trait such as crime or aggression may be engineered away by purely cultural political means.

Pinker focuses on reasons he assumes were responsible for unduly repressing evidence to the contrary, notably the fear of imagined or projected political or ideological consequences.

It is important to note that the term heritability refers only to the degree of genetic variation between people on a trait. It does not refer to the degree to which a trait of a particular individual is due to environmental or genetic factors.

The traits of an individual are always a complex interweaving of both. In contrast, the "heritability index" statistically quantifies the extent to which variation between individuals on a trait is due to variation in the genes those individuals carry.

In animals where breeding and environments can be controlled experimentally, heritability can be determined relatively easily. Such experiments would be unethical for human research.

This problem can be overcome by finding existing populations of humans that reflect the experimental setting the researcher wishes to create.

One way to determine the contribution of genes and environment to a trait is to study twins. The twins share identical genes, but different family environments.

Twins reared apart are not assigned at random to foster or adoptive parents. In another kind of twin study, identical twins reared together who share family environment and genes are compared to fraternal twins reared together who also share family environment but only share half their genes.

Another condition that permits the disassociation of genes and environment is adoption. In one kind of adoption study , biological siblings reared together who share the same family environment and half their genes are compared to adoptive siblings who share their family environment but none of their genes.

In many cases, it has been found that genes make a substantial contribution, including psychological traits such as intelligence and personality.

Examples of low, medium, and high heritability traits include:. Twin and adoption studies have their methodological limits.

For example, both are limited to the range of environments and genes which they sample. Almost all of these studies are conducted in Western, first-world countries, and therefore cannot be extrapolated globally to include poorer, non-western populations.

Additionally, both types of studies depend on particular assumptions, such as the equal environments assumption in the case of twin studies, and the lack of pre-adoptive effects in the case of adoption studies.

Since the definition of "nature" in this context is tied to "heritability", the definition of "nurture" has necessarily become very wide, including any type of causality that is not heritable.

The term has thus moved away from its original connotation of "cultural influences" to include all effects of the environment, including; indeed, a substantial source of environmental input to human nature may arise from stochastic variations in prenatal development and is thus in no sense of the term "cultural".

Many properties of the brain are genetically organized, and don't depend on information coming in from the senses. The interactions of genes with environment, called gene—environment interactions , are another component of the nature—nurture debate.

A classic example of gene—environment interaction is the ability of a diet low in the amino acid phenylalanine to partially suppress the genetic disease phenylketonuria.

Yet another complication to the nature—nurture debate is the existence of gene—environment correlations. These correlations indicate that individuals with certain genotypes are more likely to find themselves in certain environments.

Thus, it appears that genes can shape the selection or creation of environments. Even using experiments like those described above, it can be very difficult to determine convincingly the relative contribution of genes and environment.

Heritability refers to the origins of differences between people. Individual development, even of highly heritable traits, such as eye color, depends on a range of environmental factors, from the other genes in the organism, to physical variables such as temperature, oxygen levels etc.

The variability of trait can be meaningfully spoken of as being due in certain proportions to genetic differences "nature" , or environments "nurture".

For highly penetrant Mendelian genetic disorders such as Huntington's disease virtually all the incidence of the disease is due to genetic differences.

Huntington's animal models live much longer or shorter lives depending on how they are cared for. At the other extreme, traits such as native language are environmentally determined: linguists have found that any child if capable of learning a language at all can learn any human language with equal facility.

At a molecular level, genes interact with signals from other genes and from the environment. While there are many thousands of single-gene-locus traits, so-called complex traits are due to the additive effects of many often hundreds of small gene effects.

A good example of this is height, where variance appears to be spread across many hundreds of loci. Extreme genetic or environmental conditions can predominate in rare circumstances—if a child is born mute due to a genetic mutation , it will not learn to speak any language regardless of the environment; similarly, someone who is practically certain to eventually develop Huntington's disease according to their genotype may die in an unrelated accident an environmental event long before the disease will manifest itself.

Steven Pinker likewise described several examples: [40] [41]. But traits that reflect the underlying talents and temperaments—how proficient with language a person is, how religious, how liberal or conservative—are partially heritable.

When traits are determined by a complex interaction of genotype and environment it is possible to measure the heritability of a trait within a population.

However, many non-scientists who encounter a report of a trait having a certain percentage heritability imagine non-interactional, additive contributions of genes and environment to the trait.

As an analogy, some laypeople may think of the degree of a trait being made up of two "buckets," genes and environment, each able to hold a certain capacity of the trait.

But even for intermediate heritabilities, a trait is always shaped by both genetic dispositions and the environments in which people develop, merely with greater and lesser plasticities associated with these heritability measures.

Heritability measures always refer to the degree of variation between individuals in a population. That is, as these statistics cannot be applied at the level of the individual, it would be incorrect to say that while the heritability index of personality is about 0.

To help to understand this, imagine that all humans were genetic clones. The heritability index for all traits would be zero all variability between clonal individuals must be due to environmental factors.

And, contrary to erroneous interpretations of the heritability index, as societies become more egalitarian everyone has more similar experiences the heritability index goes up as environments become more similar, variability between individuals is due more to genetic factors.

One should also take into account the fact that the variables of heritability and environmentality are not precise and vary within a chosen population and across cultures.

It would be more accurate to state that the degree of heritability and environmentality is measured in its reference to a particular phenotype in a chosen group of a population in a given period of time.

The accuracy of the calculations is further hindered by the number of coefficients taken into consideration, age being one such variable.

The display of the influence of heritability and environmentality differs drastically across age groups: the older the studied age is, the more noticeable the heritability factor becomes, the younger the test subjects are, the more likely it is to show signs of strong influence of the environmental factors.

A study conducted by T. Bouchard, Jr. The results shown have been important evidence against the importance of environment when determining, happiness, for example.

In the Minnesota study of twins reared apart, it was actually found that there was higher correlation for monozygotic twins reared apart 0.

Also, highlighting the importance of genes, these correlations found much higher correlation among monozygotic than dizygotic twins that had a correlation of 0.

Some have pointed out that environmental inputs affect the expression of genes. The social pre-wiring hypothesis informally known as " wired to be social " refers to the ontogeny of social interaction.

The theory questions whether there is a propensity to socially oriented action already present before birth. Research in the theory concludes that newborns are born into the world with a unique genetic wiring to be social.

Circumstantial evidence supporting the social pre-wiring hypothesis can be revealed when examining newborns' behavior.

Newborns, not even hours after birth, have been found to display a preparedness for social interaction. This preparedness is expressed in ways such as their imitation of facial gestures.

This observed behavior cannot be contributed to any current form of socialization or social construction. Rather, newborns most likely inherit to some extent social behavior and identity through genetics.

Principal evidence of this theory is uncovered by examining twin pregnancies. The main argument is, if there are social behaviors that are inherited and developed before birth, then one should expect twin foetuses to engage in some form of social interaction before they are born.

Thus, ten foetuses were analyzed over a period of time using ultrasound techniques. Using kinematic analysis, the results of the experiment were that the twin foetuses would interact with each other for longer periods and more often as the pregnancies went on.

Researchers were able to conclude that the performance of movements between the co-twins were not accidental but specifically aimed.

The social pre-wiring hypothesis was proven correct: [43]. The central advance of this study is the demonstration that ' social actions ' are already performed in the second trimester of gestation.

Starting from the 14th week of gestation twin foetuses plan and execute movements specifically aimed at the co-twin. These findings force us to predate the emergence of social behavior : when the context enables it, as in the case of twin foetuses, other-directed actions are not only possible but predominant over self-directed actions.

Traits may be considered to be adaptations such as the umbilical cord , byproducts of adaptations the belly button or due to random variation convex or concave belly button shape.

For example, the rewarding sweet taste of sugar and the pain of bodily injury are obligate psychological adaptations—typical environmental variability during development does not much affect their operation.

On the other hand, facultative adaptations are somewhat like "if-then" statements. The attachment style of adults, for example, a "secure attachment style," the propensity to develop close, trusting bonds with others is proposed to be conditional on whether an individual's early childhood caregivers could be trusted to provide reliable assistance and attention.

An example of a facultative physiological adaptation is tanning of skin on exposure to sunlight to prevent skin damage.

Facultative social adaptation have also been proposed. For example, whether a society is warlike or peaceful has been proposed to be conditional on how much collective threat that society is experiencing [47].

Quantitative studies of heritable traits throw light on the question. Developmental genetic analysis examines the effects of genes over the course of a human lifespan.

Subsequent developmental genetic analyses found that variance attributable to additive environmental effects is less apparent in older individuals, with estimated heritability of IQ increasing in adulthood.

Multivariate genetic analysis examines the genetic contribution to several traits that vary together. For example, multivariate genetic analysis has demonstrated that the genetic determinants of all specific cognitive abilities e.

Similarly, multivariate genetic analysis has found that genes that affect scholastic achievement completely overlap with the genes that affect cognitive ability.

Extremes analysis examines the link between normal and pathological traits. For example, it is hypothesized that a given behavioral disorder may represent an extreme of a continuous distribution of a normal behavior and hence an extreme of a continuous distribution of genetic and environmental variation.

Depression, phobias, and reading disabilities have been examined in this context. For a few highly heritable traits, studies have identified loci associated with variance in that trait, for instance in some individuals with schizophrenia.

Through studies of identical twins separated at birth, one-third of their creative thinking abilities come from genetics and two-thirds come from learning.

Evidence from behavioral genetic research suggests that family environmental factors may have an effect upon childhood IQ , accounting for up to a quarter of the variance.

The American Psychological Association 's report " Intelligence: Knowns and Unknowns " states that there is no doubt that normal child development requires a certain minimum level of responsible care.

Here, environment is playing a role in what is believed to be fully genetic intelligence but it was found that severely deprived, neglectful, or abusive environments have highly negative effects on many aspects of children's intellect development.

Beyond that minimum, however, the role of family experience is in serious dispute. On the other hand, by late adolescence this correlation disappears, such that adoptive siblings no longer have similar IQ scores.

Moreover, adoption studies indicate that, by adulthood, adoptive siblings are no more similar in IQ than strangers IQ correlation near zero , while full siblings show an IQ correlation of 0.

Twin studies reinforce this pattern: monozygotic identical twins raised separately are highly similar in IQ 0. Personality is a frequently cited example of a heritable trait that has been studied in twins and adoptees using behavioral genetic study designs.

The close genetic relationship between positive personality traits and, for example, our happiness traits are the mirror images of comorbidity in psychopathology.

These personality factors were consistent across cultures, and many studies have also tested the heritability of these traits.

Identical twins reared apart are far more similar in personality than randomly selected pairs of people. Likewise, identical twins are more similar than fraternal twins.

According to this notion, everything that we are and all of our knowledge is determined by our experience. Empiricists take the position that all or most behaviors and characteristics result from learning.

In many cases, it has been found that genes make a substantial contribution, including psychological traits such as intelligence and personality.

Examples of low, medium, and high heritability traits include:. Twin and adoption studies have their methodological limits.

For example, both are limited to the range of environments and genes which they sample. Almost all of these studies are conducted in Western, first-world countries, and therefore cannot be extrapolated globally to include poorer, non-western populations.

Additionally, both types of studies depend on particular assumptions, such as the equal environments assumption in the case of twin studies, and the lack of pre-adoptive effects in the case of adoption studies.

Since the definition of "nature" in this context is tied to "heritability", the definition of "nurture" has necessarily become very wide, including any type of causality that is not heritable.

The term has thus moved away from its original connotation of "cultural influences" to include all effects of the environment, including; indeed, a substantial source of environmental input to human nature may arise from stochastic variations in prenatal development and is thus in no sense of the term "cultural".

Many properties of the brain are genetically organized, and don't depend on information coming in from the senses. The interactions of genes with environment, called gene—environment interactions , are another component of the nature—nurture debate.

A classic example of gene—environment interaction is the ability of a diet low in the amino acid phenylalanine to partially suppress the genetic disease phenylketonuria.

Yet another complication to the nature—nurture debate is the existence of gene—environment correlations. These correlations indicate that individuals with certain genotypes are more likely to find themselves in certain environments.

Thus, it appears that genes can shape the selection or creation of environments. Even using experiments like those described above, it can be very difficult to determine convincingly the relative contribution of genes and environment.

Heritability refers to the origins of differences between people. Individual development, even of highly heritable traits, such as eye color, depends on a range of environmental factors, from the other genes in the organism, to physical variables such as temperature, oxygen levels etc.

The variability of trait can be meaningfully spoken of as being due in certain proportions to genetic differences "nature" , or environments "nurture".

For highly penetrant Mendelian genetic disorders such as Huntington's disease virtually all the incidence of the disease is due to genetic differences.

Huntington's animal models live much longer or shorter lives depending on how they are cared for. At the other extreme, traits such as native language are environmentally determined: linguists have found that any child if capable of learning a language at all can learn any human language with equal facility.

At a molecular level, genes interact with signals from other genes and from the environment. While there are many thousands of single-gene-locus traits, so-called complex traits are due to the additive effects of many often hundreds of small gene effects.

A good example of this is height, where variance appears to be spread across many hundreds of loci. Extreme genetic or environmental conditions can predominate in rare circumstances—if a child is born mute due to a genetic mutation , it will not learn to speak any language regardless of the environment; similarly, someone who is practically certain to eventually develop Huntington's disease according to their genotype may die in an unrelated accident an environmental event long before the disease will manifest itself.

Steven Pinker likewise described several examples: [40] [41]. But traits that reflect the underlying talents and temperaments—how proficient with language a person is, how religious, how liberal or conservative—are partially heritable.

When traits are determined by a complex interaction of genotype and environment it is possible to measure the heritability of a trait within a population.

However, many non-scientists who encounter a report of a trait having a certain percentage heritability imagine non-interactional, additive contributions of genes and environment to the trait.

As an analogy, some laypeople may think of the degree of a trait being made up of two "buckets," genes and environment, each able to hold a certain capacity of the trait.

But even for intermediate heritabilities, a trait is always shaped by both genetic dispositions and the environments in which people develop, merely with greater and lesser plasticities associated with these heritability measures.

Heritability measures always refer to the degree of variation between individuals in a population. That is, as these statistics cannot be applied at the level of the individual, it would be incorrect to say that while the heritability index of personality is about 0.

To help to understand this, imagine that all humans were genetic clones. The heritability index for all traits would be zero all variability between clonal individuals must be due to environmental factors.

And, contrary to erroneous interpretations of the heritability index, as societies become more egalitarian everyone has more similar experiences the heritability index goes up as environments become more similar, variability between individuals is due more to genetic factors.

One should also take into account the fact that the variables of heritability and environmentality are not precise and vary within a chosen population and across cultures.

It would be more accurate to state that the degree of heritability and environmentality is measured in its reference to a particular phenotype in a chosen group of a population in a given period of time.

The accuracy of the calculations is further hindered by the number of coefficients taken into consideration, age being one such variable. The display of the influence of heritability and environmentality differs drastically across age groups: the older the studied age is, the more noticeable the heritability factor becomes, the younger the test subjects are, the more likely it is to show signs of strong influence of the environmental factors.

A study conducted by T. Bouchard, Jr. The results shown have been important evidence against the importance of environment when determining, happiness, for example.

In the Minnesota study of twins reared apart, it was actually found that there was higher correlation for monozygotic twins reared apart 0.

Also, highlighting the importance of genes, these correlations found much higher correlation among monozygotic than dizygotic twins that had a correlation of 0.

Some have pointed out that environmental inputs affect the expression of genes. The social pre-wiring hypothesis informally known as " wired to be social " refers to the ontogeny of social interaction.

The theory questions whether there is a propensity to socially oriented action already present before birth.

Research in the theory concludes that newborns are born into the world with a unique genetic wiring to be social. Circumstantial evidence supporting the social pre-wiring hypothesis can be revealed when examining newborns' behavior.

Newborns, not even hours after birth, have been found to display a preparedness for social interaction. This preparedness is expressed in ways such as their imitation of facial gestures.

This observed behavior cannot be contributed to any current form of socialization or social construction. Rather, newborns most likely inherit to some extent social behavior and identity through genetics.

Principal evidence of this theory is uncovered by examining twin pregnancies. The main argument is, if there are social behaviors that are inherited and developed before birth, then one should expect twin foetuses to engage in some form of social interaction before they are born.

Thus, ten foetuses were analyzed over a period of time using ultrasound techniques. Using kinematic analysis, the results of the experiment were that the twin foetuses would interact with each other for longer periods and more often as the pregnancies went on.

Researchers were able to conclude that the performance of movements between the co-twins were not accidental but specifically aimed.

The social pre-wiring hypothesis was proven correct: [43]. The central advance of this study is the demonstration that ' social actions ' are already performed in the second trimester of gestation.

Starting from the 14th week of gestation twin foetuses plan and execute movements specifically aimed at the co-twin. These findings force us to predate the emergence of social behavior : when the context enables it, as in the case of twin foetuses, other-directed actions are not only possible but predominant over self-directed actions.

Traits may be considered to be adaptations such as the umbilical cord , byproducts of adaptations the belly button or due to random variation convex or concave belly button shape.

For example, the rewarding sweet taste of sugar and the pain of bodily injury are obligate psychological adaptations—typical environmental variability during development does not much affect their operation.

On the other hand, facultative adaptations are somewhat like "if-then" statements. The attachment style of adults, for example, a "secure attachment style," the propensity to develop close, trusting bonds with others is proposed to be conditional on whether an individual's early childhood caregivers could be trusted to provide reliable assistance and attention.

An example of a facultative physiological adaptation is tanning of skin on exposure to sunlight to prevent skin damage.

Facultative social adaptation have also been proposed. For example, whether a society is warlike or peaceful has been proposed to be conditional on how much collective threat that society is experiencing [47].

Quantitative studies of heritable traits throw light on the question. Developmental genetic analysis examines the effects of genes over the course of a human lifespan.

Subsequent developmental genetic analyses found that variance attributable to additive environmental effects is less apparent in older individuals, with estimated heritability of IQ increasing in adulthood.

Multivariate genetic analysis examines the genetic contribution to several traits that vary together. For example, multivariate genetic analysis has demonstrated that the genetic determinants of all specific cognitive abilities e.

Similarly, multivariate genetic analysis has found that genes that affect scholastic achievement completely overlap with the genes that affect cognitive ability.

Extremes analysis examines the link between normal and pathological traits. For example, it is hypothesized that a given behavioral disorder may represent an extreme of a continuous distribution of a normal behavior and hence an extreme of a continuous distribution of genetic and environmental variation.

Depression, phobias, and reading disabilities have been examined in this context. For a few highly heritable traits, studies have identified loci associated with variance in that trait, for instance in some individuals with schizophrenia.

Through studies of identical twins separated at birth, one-third of their creative thinking abilities come from genetics and two-thirds come from learning.

Evidence from behavioral genetic research suggests that family environmental factors may have an effect upon childhood IQ , accounting for up to a quarter of the variance.

The American Psychological Association 's report " Intelligence: Knowns and Unknowns " states that there is no doubt that normal child development requires a certain minimum level of responsible care.

Here, environment is playing a role in what is believed to be fully genetic intelligence but it was found that severely deprived, neglectful, or abusive environments have highly negative effects on many aspects of children's intellect development.

Beyond that minimum, however, the role of family experience is in serious dispute. On the other hand, by late adolescence this correlation disappears, such that adoptive siblings no longer have similar IQ scores.

Moreover, adoption studies indicate that, by adulthood, adoptive siblings are no more similar in IQ than strangers IQ correlation near zero , while full siblings show an IQ correlation of 0.

Twin studies reinforce this pattern: monozygotic identical twins raised separately are highly similar in IQ 0.

Personality is a frequently cited example of a heritable trait that has been studied in twins and adoptees using behavioral genetic study designs.

The close genetic relationship between positive personality traits and, for example, our happiness traits are the mirror images of comorbidity in psychopathology.

These personality factors were consistent across cultures, and many studies have also tested the heritability of these traits. Identical twins reared apart are far more similar in personality than randomly selected pairs of people.

Likewise, identical twins are more similar than fraternal twins. According to this notion, everything that we are and all of our knowledge is determined by our experience.

Empiricists take the position that all or most behaviors and characteristics result from learning. Behaviorism is a good example of a theory rooted in empiricism.

The behaviorists believe that all actions and behaviors are the results of conditioning. Theorists such as John B. Watson believed that people could be trained to do and become anything, regardless of their genetic background.

For example, when a person achieves tremendous academic success, did they do so because they are genetically predisposed to be successful or is it a result of an enriched environment?

If a man abuses his wife and kids, is it because he was born with violent tendencies or is it something he learned by observing his own parent's behavior?

A few examples of biologically determined characteristics nature include certain genetic diseases, eye color, hair color, and skin color.

Other things like life expectancy and height have a strong biological component, but they are also influenced by environmental factors and lifestyle.

An example of a nativist theory within psychology is Chomsky's concept of a language acquisition device or LAD. Some characteristics are tied to environmental influences.

How a person behaves can be linked to influences such as parenting styles and learned experiences.

For example, a child might learn through observation and reinforcement to say 'please' and 'thank you. One example of an empiricist theory within psychology is Albert Bandura's social learning theory.

According to the theory, people learn by observing the behavior of others. In his famous Bobo doll experiment , Bandura demonstrated that children could learn aggressive behaviors simply by observing another person acting aggressively.

Even today, research in psychology often tends to emphasize one influence over the other. In biopsychology , for example, researchers conduct studies exploring how neurotransmitters influence behavior, which emphasizes the nature side of the debate.

In social psychology , researchers might conduct studies looking at how things such as peer pressure and social media influence behaviors, stressing the importance of nurture.

What researchers do know is that the interaction between heredity and environment is often the most important factor of all.

Perfect pitch is the ability to detect the pitch of a musical tone without any reference. Researchers have found that this ability tends to run in families and believe that it might be tied to a single gene.

However, they've also discovered that possessing the gene alone is not enough to develop this ability. Instead, musical training during early childhood is necessary to allow this inherited ability to manifest itself.

Height is another example of a trait that is influenced by nature and nurture interaction. A child might come from a family where everyone is tall, and he may have inherited these genes for height.

However, if he grows up in a deprived environment where he does not receive proper nourishment, he might never attain the height he might have had he grown up in a healthier environment.

Throughout the history of psychology , however, this debate has continued to stir up controversy.

Eugenics, for example, was a movement heavily influenced by the nativist approach. Galton believed that intelligent individuals should be encouraged to marry and have many children, while less intelligent individuals should be discouraged from reproducing.

How much can we boost I. Also, biological siblings are more similar in personality than adoptive siblings. Each observation suggests that personality is heritable to a certain extent.

Adoption studies also directly measure the strength of shared family effects. Adopted siblings share only family environment. Most adoption studies indicate that by adulthood the personalities of adopted siblings are little or no more similar than random pairs of strangers.

This would mean that shared family effects on personality are zero by adulthood.

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