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. 2017 Sep 8;7:11002. doi: 10.1038/s41598-017-10885-y

Figure 1.

Figure 1

Experimental stimuli and task. (a) Experimental conditions. For each condition, stimuli were sampled from 11 form and motion morph levels s f and s m, respectively. In the form condition, the form morph level varied while the motion morph level was kept constant at 0.5 (“Form”; blue line), and vice versa for the motion condition (“Motion”; green line). In combined-cue conditions, motion and form morph levels were either morphed by the same amount (“Comb”; red line) or differed slightly (“Comb, +Δ”: Form > Motion; orange line; “Comb, −Δ”: Form < Motion; purple line). Markers represent the sampled morph levels tested in the experiment. (b) Representative frames of the two “basic” (corresponding to the stimuli at (0,0) and (1,1) in panel a) dynamic face stimuli “Laura” and “Susan” (“old off”; upper row) and their “old” morphs (“old on”; lower row). Dynamic face stimuli were designed in Poser 2012 (SmithMicro, Inc., Watsonville, CA, USA). (c) Trial sequence. Subjects performed an identity categorization task (i.e., 2AFC) based on form (letter ‘F’), motion (letter ‘M’) or both combined (letter ‘C’) as indicated by a cue at the beginning of a trial. On each trial, one of the 1 s stimuli, sampled from the stimulus space (panel a) was presented followed by an inter-trial interval (ITI) of max. 2 s.