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Ventral prefrontal cortex is not essential for working memory

M F Rushworth1, P D Nixon, M J Eacott

  • 1Department of Experimental Psychology, University of Oxford, Oxford OX1 3UD, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 15, 1997
PubMed
Summary
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The inferior convexity (IC) in the prefrontal cortex is not crucial for working memory. Lesions to the IC did not impair monkeys on visual or color tasks with delays, suggesting a role in attention.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Studies

Background:

  • The prefrontal cortex is recognized for its role in working memory.
  • The inferior convexity (IC) has been hypothesized to be specifically involved in form and color working memory.

Purpose of the Study:

  • To investigate the role of the inferior convexity (IC) in working memory for visual and color information.
  • To determine if lesions to the IC impair performance on tasks requiring delayed visual pattern association and color matching.

Main Methods:

  • Monkeys with lesions to the IC (areas 47/12 and 45A) were tested on visual pattern association and color-matching tasks with varying delays.
  • Experiment 1 involved conservative IC lesions and tested tasks with delays up to 8 seconds.
  • Experiment 2 involved larger lesions and assessed relearning and delayed performance.

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Main Results:

  • Conservative IC lesions did not affect performance on visual association or color-matching tasks with delays up to 8 seconds.
  • Larger lesions encompassing areas 47/12 and 45A caused deficits in relearning simultaneous color matching.
  • Despite relearning deficits, delayed color matching (up to 8 seconds) remained unimpaired after larger lesions.

Conclusions:

  • The inferior convexity (IC) may not be critical for the core mechanisms of working memory.
  • Findings suggest the IC's role might be more aligned with stimulus selection and attention rather than working memory itself.