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Thread: Heritability Estimates/ IQ-Behavioural Correlations

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    Post Heritability Estimates/ IQ-Behavioural Correlations

    Heritability Estimates

    Variance attributed to each factor in co-efficient form

    Trait-Genetic:Shared Environment:Non-Shared Environment/ Source

    IQ-General- .50:.25: .25/ Ridley 2003
    IQ-Adults (g in this case)- .80:.00:.20/ Jensen 1998
    IQ-Adults- .75: .00: .25 /American Psychological Association (Neisser) 1996
    OCEAN Personality Traits- >.40 : <.10: .25 / Bouchard 1999 *
    Schizophrenia- .80: .00 (?): .20 (?)/ Tsuang, M., Stone, W.S., and Faraone, S.V. 2001
    Criminality- .58: .16 :.26 / Eysenck 1990
    Psychoticism- .84: -.22: .38/ Baker and Daniels 1990

    * .25 of the variance attributed to test error

    IQ Correlations

    Identical twins reared together- .86 /Plomin 2000
    Identical twins reared apart- .78/ Plomin 2000
    Identical twins reared apart- .76/ Bouchard 1979 (?)
    Fraternal twins reared together- .60/ Plomin 2000
    Fraternal twins reared together- .55/ Bouchard 1979 (?)
    Full Siblings reared together- .47/ Plomin 2000
    Same Individual tested twice- .87/ Bouchard 1979 (?)
    Parent-Biological Children (Same home)- .40 */ Bouchard 1979 (?)
    Parent-Biological Children (Different homes)-.31 */Bouchard 1979 (?)
    Adopted Children reared together -.00 **/Bouchard 1979 (?)
    Unrelated Individuals living apart-.00/Bouchard 1979 (?)

    * Correlations (.40 and .31) likely established before child had fully matured, and will therefore become increasingly similar as child ages and approaches adulthood

    ** Correlation established in adulthood, hence complete lack of IQ similiarity

    Behavioural Correlations

    Right-Wing Attitudes

    Identical Twins Reared Apart- .69 /Bouchard 1979 (?)
    Fraternal Twins Reared Apart- .00/ Bouchard 1979 (?)

    Religious Fundamentalism

    Identical Twins Reared Apart-.62/ Bouchard 1979 (?)
    Fraternal Twins Reared Apart-.02/ Bouchard 1979 (?)

    Religiousity (Broad)

    Identical twins Reared Apart- .58/ Bouchard 1979(?)
    Fraternal Twins Reared Apart-.27/ Bouchard 1979(?)

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    Can you post this in English?

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    Can you post this in English?
    Alright, well I suppose I should define a few terms to make several elements of my post clearer.

    Heritability refers to the percentage (although in this case decimal figures between 0 and 1 are used) of the variance exhibited within a specific population which can be attributed to genetic factors. For example, if the heritability of IQ among adults in Europe and North America is 0.80, it signifies that 80% of the IQ variance exhibited by adult European and North Americans is derived from genes.

    The Shared environment pertains to environmental factors by which all members of a given population experience (i.e. family life, upbringing etc), and are therefore not unique or specific to the individual.

    The Non-Shared environment refers to environmental factors which are unique or specific to the individual (i.e. pre-natal development).

    I've separated the co-effificients respective to each factor for each given trait by semi-colons. For example, in terms of criminality, the variance attributed to genetic factors is .58, to shared environmental factors .16, and to non-shared environmental factors .26.

    One other note I should make is the designation of the acronym OCEAN. The OCEAN (or "Big Five") personality traits account for a large majority of the personality variance exhibited in the population at large, and can be defined as such:

    Openness to Experience
    Conscientiousness
    Extraversion
    Agreeableness
    Neuroticism

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    I don't see my hero Dr. Jensen cited. From memory, it seems to me that his figure was somewhere near .90 using twin studies raised together and seperately. Whole forests have died in rebutals to Jensen. Has anyone really unseated his work?

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    I don't see my hero Dr. Jensen cited.
    I made sure to include him.

    IQ-Adults (g in this case)- .80:.00:.20/ Jensen 1998

    From memory, it seems to me that his figure was somewhere near .90 using twin studies raised together and seperately.
    Quite possibly, although the figure he uses throughout "The g Factor" is 0.8.

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    Then this thread was for you, Doc:

    http://www.forums.skadi.net/showthre...785#post102785

    I like Arthur Jensen, too. What a brave man.

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    Other Heritability Estimates

    Brain-White Matter-0.87/Posthuma 2002
    Brain-Grey Matter- 0.82/ Posthuma 2002
    Brain Volume-General-.85/Baare 2001
    g (derived from WAIS)-.86/Posthuma 2002
    Working Memory-.67/Posthuma 2002

    Other Correlations

    IQ-Head Size-0.20 (body size controlled for?)/Jensen 1998
    IQ-Brain Size-0.40(body size controlled for)/Jensen 1998
    Head Size-Brain Size-0.50

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    Post Re: Heritability Estimates/ IQ-Behavioural Correlations

    Psychoticism- .84: -.22: .38/ Baker and Daniels 1990
    I find it quite intriguing that the trait of psychoticism exhibits a negative correlation with the shared environment.

    I haven't had the opportunity to examine the specific study which yielded such estimates, although I presume that the data involved:

    1) The scores of unrelated individuals reared in the same home on the psychoticism personality facet were negatively correlated (to a small degree).

    2) The psychoticism scores of identical twins reared apart were more concordant than those of identical twins reared together.

    The two extremes of the psychoticism personality dimension are essentially altruism and conscientiousness on one end and psychopathy on the other. The evolutionary basis of psychopathy can arguably be explained through frequency dependent evolution and the distinction between individuals who "cheat" and those who "co-operate," in that the "cheater phenotype" (psychopath), who survives through the manipulation and exploitation of others, will continue to be expressed as long as those who co-operate remain far more numerous within the population. Perhaps this explains why identical twins reared apart have more similar psychoticism scores than identical twins reared together (if they do indeed have more similar scores, which is only my assumption at this point), as the strategy of the "cheater" is invariably less successful if another cheater resides in close proximity (the same household in this case).

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    Re: Heritability Estimates/ IQ-Behavioural Correlations

    Thats incredible.

    I recently had a personality theories class where they did reference the study above, however the data wasn't available. In closing she said that typically 60%-70% of your "personality" (I know thats far to encompassing) was determined by ones genetic make up.

    What highlights that the most is are the variances between the fraternal and identical siblings.
    Work will set you free!

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    Re: Heritability Estimates/ IQ-Behavioural Correlations

    Quote Originally Posted by Tore
    Behavioural Correlations

    Right-Wing Attitudes

    Identical Twins Reared Apart- .69 /Bouchard 1979 (?)
    Fraternal Twins Reared Apart- .00/ Bouchard 1979 (?)

    Religious Fundamentalism

    Identical Twins Reared Apart-.62/ Bouchard 1979 (?)
    Fraternal Twins Reared Apart-.02/ Bouchard 1979 (?)

    Religiousity (Broad)

    Identical twins Reared Apart- .58/ Bouchard 1979(?)
    Fraternal Twins Reared Apart-.27/ Bouchard 1979(?)
    You said it, Alpine Storm! Incredible. I found the above particularly interesting.

    If I'm mistaken then please correct me (anyone), but it seems like this is saying that politics and religion are significantly dependent on genetics — although it would seem that variability within a (separated) family is about as high as variability between strangers. Nevertheless, the genetic link to political views and religiosity could be made into cases for nationalism and folk religion. If people hold particular political views because of their genes, then allowing only those who are sufficiently genetically similar to particpate in the state would facilitate government. Also, if religion is genetically determined, then it would seem most natural to worship like one's ancestors did — if it was good enough for our mothers, it's good enough for me! Granted, these arguments extend way beyond the statistics cited above, but for those who want to make such arguments, these studies and others like them could be helpful.

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