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Schematic showing the outline of the task. (A) The subject is presented with three different stimuli. Each stimulus has a different feature along each one of the three feature dimensions (shape, color and texture). (B) The subject chooses one of the stimuli and receives binary reward feedback, either winning one (as in this case) or zero points. (C) After a short delay a new trial begins and the subject is presented with three new stimuli from which to choose.
