Quantifying the heritability of belief formation

Area of Science:

• Behavioral Genetics
• Cognitive Neuroscience
• Psychology

Background:

• Individual differences in behavior, traits, and mental health exhibit partial heritability.
• Previous research focused on heritability of high-order traits (e.g., happiness, education).
• This study investigates the heritability of lower-level mental processes underlying complex traits.

Purpose of the Study:

• To quantify the heritability of cognitive and affective factors in belief formation about risk.
• To identify specific mental processes contributing to the heritability of complex traits and behaviors.

Main Methods:

• Utilized a belief formation task with monozygotic and dizygotic twin pairs.
• Assessed individual differences in cognitive factors (imagination vividness, learning abilities) and affective evaluation.
• Quantified the genetic contribution to these processes.

Main Results:

• Beliefs about risk are associated with imagination vividness, affective evaluation, and learning abilities.
• Genetic contribution to individual differences in these processes ranges from 13.5% to 39%.
• Affective evaluation demonstrated a particularly robust heritability component.

Conclusions:

• Identified specific cognitive and affective factors contributing to the heritability of belief formation.
• These findings offer insights into the genetic underpinnings of complex traits and behaviors.
• Highlights the role of affect evaluation in the heritability of risk perception.