ERIC Number: EJ790923
Record Type: Journal
Publication Date: 2008
Reference Count: 0
Inspection Time and Cognitive Abilities in Twins Aged 7 to 17 Years: Age-Related Changes, Heritability and Genetic Covariance
Edmonds, Caroline J.; Isaacs, Elizabeth B.; Visscher, Peter M.; Rogers, Mary; Lanigan, Julie; Singhal, Atul; Lucas, Alan; Gringras, Paul; Denton, Jane; Deary, Ian J.
Intelligence, v36 n3 p210-225 May-Jun 2008
We studied the age-related differences in inspection time and multiple cognitive domains in a group of monozygotic (MZ) and dizygotic (DZ) twins aged 7 to 17 years. Data from 111 twin pairs and 19 singleton siblings were included. We found clear age-related trends towards more efficient visual information processing in older participants. There were substantial correlations between inspection time and cognitive abilities. The heritability of inspection time was 45%, and ranged from 73% to 85% for cognitive abilities. There were significant non-shared environmental effects on inspection time and Wechsler IQ scores, but no shared environmental effects. The genetic correlation between inspection time and Performance IQ was 0.55 and with Verbal IQ it was 0.28. There was a significant non-shared environmental correlation of 0.24 between inspection time and Verbal IQ.
Descriptors: Twins, Intelligence Quotient, Correlation, Genetics, Cognitive Processes, Cognitive Ability, Age Differences, Siblings, Visual Perception, Environmental Influences, Intelligence Tests, Inspection
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A