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Cerebral Cortex Advance Access originally published online on January 12, 2005
Cerebral Cortex 2005 15(9):1299-1307; doi:10.1093/cercor/bhi013
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© Oxford University Press 2005; all rights reserved

Three-dimensional Structure-from-motion Selectivity in the Anterior Superior Temporal Polysensory Area, STPa, of the Behaving Monkey

Kathleen C. Anderson and Ralph M. Siegel

Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ 07102, USA

Address correspondence to Ralph M. Siegel, Center for Molecular and Behavioral Neuroscience, Rutgers University, 197 University Avenue, Newark, NJ 07102, USA. Email: axon{at}cortex.rutgers.edu

Human and non-human primates are able to perceive three-dimensional structure from motion displays. Three-dimensional structure-from-motion (object-motion) displays were used to test the hypothesis that neurons in the anterior division of the superior temporal polysensory area (STPa) of monkeys can selectively respond to three-dimensional structure-from-motion. Monkeys performed a reaction time task that required the detection of a change in the fraction of structure in three-dimensional transparent sphere displays. Neurons were able to distinguish structured and unstructured three-dimensional optic flow. These cells could differentiate the change in structure-from-motion at stimulus presentation and when the animal was detecting the amount of structure in the display. Some of these neurons were also tuned for characteristics of the sphere stimuli. Cells were also tested with navigational motion and many were found to respond both to three-dimensional structure-from-motion and navigational motion. These results suggest that STPa neurons represent specific aspects of three-dimensional surface structure and that neurons within STPa contribute to the perception of three-dimensional structure-from-motion.

Key Words: monkey • optic flow • single-unit recording • structure-from-motion • temporal cortex • visual pathways


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