Research on the genetic heritability of extraversion-introversion has made use of
A) brain electrical activity measures.
B) the twin-study method.
C) differences in sensitivity to stimulation.
D) only twins that have been reared together (in the same environment).

Question

Quizplus · Accepted Answer

Research on the genetic heritability of extraversion-introversion has primarily made use of the twin-study method. By comparing the similarities of identical twins (who share 100% of their genetic material) and fraternal twins (who share approximately 50% of their genetic material), researchers can estimate the degree to which genes contribute to individual differences in extraversion-introversion. Other measures like brain electrical activity and differences in sensitivity to stimulation may provide additional insights into the neural mechanisms underlying these traits, but they do not directly quantify genetic heritability. Additionally, studies on twins reared together and apart can also help tease apart the effects of genetics and environment, but it's not explicitly stated that only twins reared together have been used in this research.

Research on the Genetic Heritability of Extraversion-Introversion Has Made Use