Summary This research challenges the paradox that despite personality theories predicting extraverts should excel at nonverbal decoding, most prior studies found no such advantage. The authors propose that introverts possess equivalent nonverbal decoding skills but struggle to apply them in multitasking contexts where decoding serves as a secondary goal.

Summary This research investigated the fundamental nature of extraversion through four studies testing whether extraversion facets are linked by reward sensitivity or sociability. The authors developed a new Social Interaction Scale to measure preference for social activity independent of reward-seeking behavior.