Figure 1.

Stimuli and experimental procedure. (A) Examples of stimuli: the 2 × 2 design (form: face or scrambled image; color: a natural‐colored or a bluish‐colored). (B) Each session comprised ∼200 stimuli (40 natural‐ and bluish‐colored facial stimuli, 40 natural and bluish‐colored scrambled stimuli, and 26–31 monkey images). Each stimulus was presented for 1,500 ms followed by a blank interval (including FP) of 1,500 ms. The participants were asked to press a button when the target monkey was presented and silently count the number of target monkey images to concentrate on the experiment. [Color figure can be viewed in the online issue, which is available at http://wileyonlinelibrary.com.]