Neuronal activity during discrimination of shapes defined by motion in area V4.
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.
Handa
Takashi
T
Department of Behavioral and Brain Sciences, Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan.
Inoue
Masato
M
Mikami
Akichika
A
D000818:Animals; D001931:Brain Mapping; D004192:Discrimination, Psychological; D005556:Form Perception / Q000502:physiology*; D007091:Image Processing, Computer-Assisted; D008253:Macaca mulatta; D008279:Magnetic Resonance Imaging; D009039:Motion Perception / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D010775:Photic Stimulation; D014793:Visual Cortex / Q000502:physiology*