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The Journal of Neurophysiology Vol. 88 No. 2 August 2002, pp. 929-941
Copyright ©2002 by the American Physiological Society
1Center for Learning and Memory, 2The Institute of Physical and Chemical Research-Massachusetts Institute of Technology Neuroscience Research Center, 3Center for Biological and Computational Learning and 4McGovern Institute for Brain Research, 5Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Freedman, David J.,
Maximilian Riesenhuber,
Tomaso Poggio, and
Earl K. Miller.
Visual Categorization and the Primate Prefrontal Cortex:
Neurophysiology and Behavior. J. Neurophysiol. 88: 929-941, 2002. The ability to group stimuli into
meaningful categories is a fundamental cognitive process. To explore
its neuronal basis, we trained monkeys to categorize computer-generated
stimuli as "cats" and "dogs." A morphing system was used to
systematically vary stimulus shape and precisely define a category
boundary. Psychophysical testing and analysis of eye movements suggest
that the monkeys categorized the stimuli by attending to multiple
stimulus features. Neuronal activity in the lateral prefrontal cortex
reflected the category of visual stimuli and changed with learning when a monkey was retrained with the same stimuli assigned to new
categories. Further, many neurons showed activity that appeared to
reflect the monkey's decision about whether two stimuli were from the same category or not. These results suggest that the lateral prefrontal cortex is an important part of the neuronal circuitry underlying category learning and category-based behaviors.
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