A neural code for three-dimensional object shape in macaque inferotemporal cortex.
Previous investigations of the neural code for complex object shape have focused on two-dimensional pattern representation. This may be the primary mode for object vision given its simplicity and direct relation to the retinal image. In contrast, three-dimensional shape representation requires higher-dimensional coding derived from extensive computation. We found evidence for an explicit neural code for complex three-dimensional object shape. We used an evolutionary stimulus strategy and linear/nonlinear response models to characterize three-dimensional shape responses in macaque monkey inferotemporal cortex (IT). We found widespread tuning for three-dimensional spatial configurations of surface fragments characterized by their three-dimensional orientations and joint principal curvatures. Configural representation of three-dimensional shape could provide specific knowledge of object structure to support guidance of complex physical interactions and evaluation of object functionality and utility.
Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Yukako
Y
Yamane
Eric T
ET
Carlson
Katherine C
KC
Bowman
Zhihong
Z
Wang
Charles E
CE
Connor
D000200:Action Potentials / Q000502:physiology; D000465:Algorithms; D000818:Animals; D001522:Behavior, Animal; D001931:Brain Mapping; D003118:Color Perception / Q000502:physiology; D003463:Cues; D005260:Female; D005556:Form Perception / Q000502:physiology*; D008253:Macaca mulatta; D008297:Male; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology; D016011:Normal Distribution; D009949:Orientation / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*