Fig. 2.

BOLD activity correlation with extroversion and introversion to humor appreciation. (A) Whole-brain BOLD signal correlations with extroversion (red) and introversion (blue) when subjectively chosen humorous cartoons were subtracted from cartoons determined nonhumorous (P < 0.05). Note the right vlPFC activation with extroversion (more orbital portions can be viewed in Fig. 4). TP, temporal pole. (B) Amygdala BOLD signal correlation with introversion. (C) Scatter plot illustrating the increased amygdala activation with introversion.