Fig. 1
From: Attention and stimulus structure interact during ensemble encoding of facial expression
Twenty facial expression stimuli from two identities used in all experiments. Single-face stimuli relied on 20 different expressions from two facial identities (i.e., actors). Seven expressions with positive valence and seven with negative valence were selected to construct positive ensembles and negative ensembles, respectively (blue = positive; red = negative, black = neutral/ambiguous).
