In one massive study of 11,000 twin pairs in four countries,the heritability of general intelligence was found to be greatest during

A) early childhood.
B) middle childhood.
C) adolescence.
D) young adulthood.

General Intelligence

A theoretical model proposing a single, overarching intellectual capability that underlies specific cognitive abilities, such as reasoning, problem-solving, and knowledge.

Heritability

A measure of how much of the variation in a trait among individuals within a population is due to genetic differences.

Twin Pairs

Two individuals born at the same time to the same mother, used in research to study the effects of genetics vs. environment.