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. 2016 Nov 21;14(11):e1002578. doi: 10.1371/journal.pbio.1002578

Fig 3. FMRI stimuli and protocol.

Fig 3

(A) The target face (the faces of a coauthor here are for illustration purposes only; they were not used in the experiments) was centered in either the left or right visual field and was flanked by four gratings, two in the upper visual field and two in the lower visual field (L: left visual field; R: right visual field). (B) Region-of-interest (ROI) definition. The flickering patches were used to define ROIs in V1, corresponding to the target face (left), nearby gratings (middle), and far gratings (right). (C) FMRI procedure. Each face flanked by four gratings was presented for 0.3 s, followed by a 1.7-s fixation interval. Subjects were asked to discriminate the gender of each face (male or female) while maintaining central fixation throughout the trial.