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Reaction time, inhibition, working memory and 'delay aversion' performance: genetic influences and their
Jonna Kuntsi1, Hannah Rogers, Greer Swinard
1MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London, UK. j.kuntsi@iop.kcl.ac.uk
Psychological Medicine
|August 3, 2006
Summary
This study found moderate genetic influences on cognitive tasks like reaction time and working memory in twins. Combining related tasks boosted heritability estimates, highlighting the importance of reliability for psychiatric genetic research.
Area of Science:
- Behavioral Genetics
- Cognitive Neuroscience
- Psychiatric Genetics
Background:
- Candidate endophenotypes require significant genetic influences for psychiatric genetic research utility.
- Limited data exists on genetic and environmental influences on cognitive-experimental tasks.
- Investigating test-retest reliability's impact on heritability estimates is crucial.
Purpose of the Study:
- To assess genetic and environmental influences on cognitive tasks in a twin sample.
- To examine the effect of test-retest reliability on heritability estimates.
Main Methods:
- Assessed 400 twin pairs (ages 7-9) on reaction time, inhibition, working memory, and delay aversion.
- Utilized existing test-retest reliability data for key cognitive measures.
Main Results:
- Moderate genetic influences were observed for reaction time, inhibition, and working memory.
- Combining theoretically related tasks increased heritability estimates (e.g., 60% for mean reaction time).
- Psychometric properties like reliability and ceiling effects substantially impacted heritability estimates.
Conclusions:
- Several cognitive variables are suitable for endophenotype studies linking genes to cognition and motivation.
- Underestimation of genetic influences can compromise utility for genetic mapping studies.
- Addressing psychometric properties is essential for accurate heritability estimation.
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