Perceptual Speed and IQ Are Associated Through Common Genetic Factors.
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| Title: | Perceptual Speed and IQ Are Associated Through Common Genetic Factors. |
|---|---|
| Authors: | Posthuma, D., de Geus, E.J.C., Boomsma, D.I. |
| Source: | Behavior Genetics. Nov2001, Vol. 31 Issue 6, p593-602. 10p. |
| Subjects: | Intellect & genetics, Twins, Behavior genetics |
| Abstract: | Individual differences in inspection time explain about 20% of IQ test variance. To determine whether the association between inspection time and IQ is mediated by common genes or by a common environmental factor, inspection time and IQ were assessed in an extended twin design. Data from 688 participants from 271 families were collected as part of a large ongoing project on the genetics of adult brain function and cognition. The sample consisted of a young adult cohort (mean age 26.2 years) and an older adult cohort (mean age 50.4 years). IQ was assessed with the Dutch version of the WAIS-3R. Inspection time was measured in the so-called Π-paradigm, in which a subject is asked to decide which leg of the Π-figure is longest at varying display times of the Π-figure. The number of correct inspections per second (i.e., the reciprocal of inspection time) was used to index perceptual speed. For Verbal IQ and Performance IQ, heritabilities were 85% and 69%, respectively. For perceptual speed, 46% of the total variance was explained by genetic variance. No differences in heritability estimates across age cohorts or sexes were found. Across the whole sample, a significant phenotypic correlation was found between perceptual speed and Verbal IQ (0.19) and between perceptual speed and Performance IQ (0.27). These correlations were entirely due to a common genetic factor that accounted for 10% of the genetic variance in verbal IQ and for 22% of the genetic variance in performance IQ. This factor is hypothesized to reflect the influence of genetic factors that determine axonal myelination in the central nervous system. [ABSTRACT FROM AUTHOR] |
| Copyright of Behavior Genetics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 11304951 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Perceptual Speed and IQ Are Associated Through Common Genetic Factors. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Posthuma%2C+D%2E%22">Posthuma, D.</searchLink><br /><searchLink fieldCode="AR" term="%22de+Geus%2C+E%2EJ%2EC%2E%22">de Geus, E.J.C.</searchLink><br /><searchLink fieldCode="AR" term="%22Boomsma%2C+D%2EI%2E%22">Boomsma, D.I.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Behavior+Genetics%22">Behavior Genetics</searchLink>. Nov2001, Vol. 31 Issue 6, p593-602. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Intellect+%26+genetics%22">Intellect & genetics</searchLink><br /><searchLink fieldCode="DE" term="%22Twins%22">Twins</searchLink><br /><searchLink fieldCode="DE" term="%22Behavior+genetics%22">Behavior genetics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Individual differences in inspection time explain about 20% of IQ test variance. To determine whether the association between inspection time and IQ is mediated by common genes or by a common environmental factor, inspection time and IQ were assessed in an extended twin design. Data from 688 participants from 271 families were collected as part of a large ongoing project on the genetics of adult brain function and cognition. The sample consisted of a young adult cohort (mean age 26.2 years) and an older adult cohort (mean age 50.4 years). IQ was assessed with the Dutch version of the WAIS-3R. Inspection time was measured in the so-called Π-paradigm, in which a subject is asked to decide which leg of the Π-figure is longest at varying display times of the Π-figure. The number of correct inspections per second (i.e., the reciprocal of inspection time) was used to index perceptual speed. For Verbal IQ and Performance IQ, heritabilities were 85% and 69%, respectively. For perceptual speed, 46% of the total variance was explained by genetic variance. No differences in heritability estimates across age cohorts or sexes were found. Across the whole sample, a significant phenotypic correlation was found between perceptual speed and Verbal IQ (0.19) and between perceptual speed and Performance IQ (0.27). These correlations were entirely due to a common genetic factor that accounted for 10% of the genetic variance in verbal IQ and for 22% of the genetic variance in performance IQ. This factor is hypothesized to reflect the influence of genetic factors that determine axonal myelination in the central nervous system. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Behavior Genetics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1023/A:1013349512683 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 593 Subjects: – SubjectFull: Intellect & genetics Type: general – SubjectFull: Twins Type: general – SubjectFull: Behavior genetics Type: general Titles: – TitleFull: Perceptual Speed and IQ Are Associated Through Common Genetic Factors. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Posthuma, D. – PersonEntity: Name: NameFull: de Geus, E.J.C. – PersonEntity: Name: NameFull: Boomsma, D.I. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2001 Type: published Y: 2001 Identifiers: – Type: issn-print Value: 00018244 Numbering: – Type: volume Value: 31 – Type: issue Value: 6 Titles: – TitleFull: Behavior Genetics Type: main |
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