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Comparison of Primate Prefrontal and Premotor Cortex Neuronal Activity during Visual Categorization

Author(s): Cromer, Jason A.; Roy, Jefferson E.; Buschman, Timothy J.; Miller, Earl K.

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Abstract: Previous work has shown that neurons in the prefrontal cortex (PFC) show selectivity for learned categorical groupings. In contrast, brain regions lower in the visual hierarchy, such as inferior temporal cortex, do not seem to favor category information over information about physical appearance. However, the role of premotor cortex (PMC) in categorization has not been studied, despite evidence that PMC is strongly engaged by well learned tasks and reflects learned rules. Here, we directly compare PFC neurons to those in the PMC during visual categorization. Unlike PFC, relatively few PMC neurons distinguished between categories of visual images during a delayed match-to-category task. However, despite the lack of category information in the PMC, more than half of the neurons in both PFC and PMC reflected whether the category of a test image did or did not match the category of a sample image (i.e., had match information). Thus, PFC neurons represented all variables required to solve the cognitive problem while PMC neurons instead represented only the final decision variable that drove the appropriate motor action required to obtain a reward. This dichotomy fits well with the PFC's hypothesized role in learning arbitrary information and directing behavior as well as the PMC's role in motor planning.
Publication Date: Nov-2011
Citation: Cromer, Jason A, Roy, Jefferson E, Buschman, Timothy J, Miller, Earl K. (2011). Comparison of Primate Prefrontal and Premotor Cortex Neuronal Activity during Visual Categorization. Journal of Cognitive Neuroscience, 23 (11), 3355 - 3365. doi:10.1162/jocn_a_00032
DOI: doi:10.1162/jocn_a_00032
ISSN: 0898-929X
EISSN: 1530-8898
Pages: 3355 - 3365
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Cognitive Neuroscience
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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