Figure 1.

(A) Experimental procedure in Experiment 1. In each trial, the baseline period consisted of stimuli of images of five vegetables, and its duration was at least 10 s. The test period consisted of two conditions presenting frontal faces: the same-face condition and the different-face condition. The duration of the test period was fixed for 10 s. The presentation order of test period 1 and 2 were changed alternately for each infant. (B) Experimental procedure in Experiment 2. The test period consisted of two conditions under the multiple viewpoint presentation: the same-face condition and the different-face condition.