Balkanizing the primate orbitofrontal cortex: distinct subregions for comparing and contrasting values.

Abstract:

:The primate orbitofrontal cortex (OFC) is often treated as a single entity, but architectonic and connectional neuroanatomy indicate that it has distinguishable parts. Nevertheless, few studies have attempted to dissociate the functions of its subregions. Here we review findings from recent neuropsychological and neurophysiological studies that do so. The lateral OFC seems to be important for learning, representing, and updating specific object-reward associations. The medial OFC seems to be important for value comparisons and choosing among objects on that basis. Rather than viewing this dissociation of function in terms of learning versus choosing, however, we suggest that it reflects the distinction between contrasts and comparisons: differences versus similarities. Making use of high-dimensional representations that arise from the convergence of several sensory modalities, the lateral OFC encodes contrasts among outcomes. The medial OFC reduces these contrasting representations of value to a single dimension, a common currency, in order to compare alternative choices.

journal_name

Ann N Y Acad Sci

authors

Rudebeck PH,Murray EA

doi

10.1111/j.1749-6632.2011.06267.x

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

1-13

eissn

0077-8923

issn

1749-6632

journal_volume

1239

pub_type

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