'Consider this snippet from recent Stanford research: "Our analysis showed extroversion to positively correlate with humor-drive blood oxygenation level-dependent signal in discrete regions of the right orbital frontal cortex, ventrolateral prefrontal cortex, and bilateral temporal cortices. Introversion correlated with increased activation in several regions, most prominently the bilateral amygdala ..."'

From the www.

I trust that clears up any misunderstandings . . . .