# Behavioral Genetics Behavioral genetics studies how genetic variation contributes to individual differences in behavior, personality, and mental abilities. Twin studies (comparing identical vs fraternal twins) and adoption studies reveal that most psychological traits are 30-60% heritable. This challenges [[The Blank Slate]] view that environment alone shapes us, supporting [[Steven Pinker]]'s argument for an evolved [[Human Nature]]. Key findings: shared family environment has surprisingly small effects after childhood; non-shared environment (unique experiences) matters more; genes influence the environments we seek out (gene-environment correlation). The field informs the [[Nature vs Nurture]] debate by showing it's not either/or—genes and environment interact in complex ways. ## Key Findings | Finding | Implication | |---------|-------------| | Most traits 30-60% heritable | Genes matter substantially | | Shared environment small effect | Parenting less deterministic than thought | | Non-shared environment matters | Unique experiences shape us | ## References - Plomin, Robert. *Blueprint: How DNA Makes Us Who We Are* (2018) ## Related - [[Nature vs Nurture]] - [[The Blank Slate]] - [[Human Nature]] - [[Steven Pinker]]