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Related Experiment Videos

Selective perceptual impairments after perirhinal cortex ablation.

M J Buckley1, M C Booth, E T Rolls

  • 1Department of Experimental Psychology, Oxford University, Oxford, OX1 3UD United Kingdom. buckley@psy.ox.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 12, 2001
PubMed
Summary

The primate perirhinal cortex is not solely for memory; it also aids in object perception. Ablation studies in macaques show impaired object discrimination, supporting its role in perception.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Studies

Background:

  • The primate perirhinal cortex (PRC) has been traditionally associated exclusively with memory functions.
  • Emerging research suggests a potential role for the PRC in object perception, challenging established views.

Purpose of the Study:

  • To investigate the contribution of the primate perirhinal cortex (PRC) to object perception.
  • To determine if the PRC's function is limited to memory or extends to perceptual tasks.

Main Methods:

  • Devised perceptual oddity tasks for macaque monkeys using touchscreen stimuli.
  • Administered tasks involving discrimination of odd stimuli based on object identity, color, shape, size, faces, and scenes.
  • Compared performance of macaques with bilateral perirhinal cortex ablations against control groups.

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Main Results:

  • Macaques with PRC ablations showed selective impairment in discriminating odd objects when simple feature differences were insufficient.
  • Performance remained intact for discriminating odd stimuli based on color, shape, or size, even in difficult conditions.
  • Impairments were observed in face and scene oddity tasks, indicating a broader perceptual role.

Conclusions:

  • The notion of the primate perirhinal cortex (PRC) being exclusively involved in memory is rejected.
  • The PRC demonstrably contributes to perception, particularly for stimuli requiring abstract processing, such as object identity.
  • The PRC is specialized for processing abstract-level stimuli, supporting both memory and perception.