Neuronal activity during discrimination of shapes defined by motion in area V4

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Abstract
To investigate the neuronal mechanisms of motion-defined shape processing, we examined single-neuron activity in area V4 in monkeys performing a shape discrimination task under the shape-from-motion (SFM) condition, in which a motion cue is critical for shape perception, and under the shape-from-luminance (SFL) condition, in which a luminance cue is critical. About 35% (30 of 86) of neurons responded selectively to shapes under both the SFM and SFL conditions. These neurons showed a similar shape preference between the SFM and SFL conditions. There was a weak tendency of lower shape selectivity in error trials. These results suggest the involvement of V4 in SFM processing as well as in SFL processing. NeuroReport 21:532-536 (C) 2010 Wolters Kluwer Health vertical bar Lippincott Williams & Wilkins.