Figure 3.

(A) The twelve clusters of stimulus items, for visualization purposes, are represented here in valence X arousal space (although they could also be plotted in positivity X negativity space and would have similar relative distances). Blue clusters represent positive stimulus items, red clusters represent negative stimulus items, magenta clusters represent ambiguously valenced stimulus items, and green clusters represent affectively neutral items. Each item is plotted according to its mean rating along each dimension, with each condition clearly occupying a different part of the space. Each color is divided into three blocks of stimuli, which are delineated by shape (cross, circle, square). Therefore, the shapes are only relevant within color, and are not related to other colors of the same shape. (B) [Top] Each cluster of items contained two face items, two scene items, and two sentence items, which were presented in a pseudo-random order within a single stimulus block; [Bottom] each functional run contained one block with each of the affective conditions: P=positive; N=negative; A=ambiguously valenced; 0=affectively neutral.