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Strategies may mediate heritable aspects of memory performance: a twin study
Kiruthiga Nandagopal1, Roy W Roring, Karl Anders Ericsson
1Department of Psychology, Florida State University, Tallahassee, FL, USA. nandagk@stanford.edu
Summary
Twin studies show that cognitive task performance heritability is influenced by strategy use. Understanding these cognitive strategies is key to explaining genetic influences on cognitive abilities.
Area of Science:
- Behavioral Genetics
- Cognitive Psychology
- Twin Studies
Background:
- Cognitive task performance is often more similar in monozygotic (MZ) than dizygotic (DZ) twins.
- The underlying cognitive mechanisms for these similarities are not well understood.
Purpose of the Study:
- To investigate how strategy use in twins during cognitive tasks affects heritability estimates.
- To explore the role of cognitive strategies in mediating genetic influences on cognitive performance.
Main Methods:
- Think-aloud protocol analysis was employed during three cognitive tasks known for high heritability and strategy susceptibility.
- A battery of traditional paper-and-pencil tests was administered to assess cognitive abilities.
Main Results:
- Strategy use impacted performance on all three cognitive tasks.
- Genetic influence was observed in two tasks, with strategy differences explaining a significant portion of this genetic effect in one task.
- Cognitive ability and metacognitive knowledge did not account for individual differences in strategy use.
Conclusions:
- This study provides the first evidence that cognitive strategy use partially mediates the heritability of cognitive task performance.
- Future research can utilize these methods to detail the development of cognitive mechanisms underlying heritable abilities.
- This approach deepens the understanding of how genetic and environmental factors interact at the level of cognitive strategies.
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