"Origins" of extraversion-introversion.
D005120:Extraversion, Psychological; D005191:Family Characteristics; D005260:Female; D005824:Genetics, Behavioral; D006801:Humans; D007100:Imitative Behavior; D007439:Introversion, Psychological; D008297:Male; D010287:Parent-Child Relations; D010553:Personality Development; D012801:Sibling Relations