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Related Experiment Videos

Prefrontal cortex and working memory for spatial response, spatial location, and visual object information in the rat

R P Kesner1, M E Hunt, J M Williams

  • 1Department of Psychology, University of Utah, Salt Lake City 84112, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|March 1, 1996
PubMed
Summary

The medial prefrontal cortex (MPF) is crucial for spatial response working memory in rats. However, its role in spatial location and visual object working memory is less significant, suggesting specialized neural circuits.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Animal Behavior

Background:

  • Working memory is essential for cognitive functions.
  • The medial prefrontal cortex (MPF) is implicated in various cognitive tasks.
  • Understanding the specific roles of MPF subregions in working memory is crucial.

Purpose of the Study:

  • To investigate the role of the medial prefrontal cortex (MPF) in different types of working memory.
  • To determine if specific subregions of the MPF mediate distinct attribute information.
  • To compare the effects of MPF lesions with hippocampal lesions on working memory.

Main Methods:

  • Rats were trained on three distinct working memory tasks: spatial response, spatial location, and visual object discrimination.
  • Lesions were made to the medial prefrontal cortex (MPF), dorsal hippocampus, and specific MPF subregions (prelimbic and infralimbic cortex).

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  • Performance on delayed matching-to-sample and delayed nonmatching-to-sample procedures was assessed.

    • Main Results:

    • MPF lesions caused profound deficits in spatial response working memory but only mild deficits in spatial location and no deficits in visual object working memory.
    • Dorsal hippocampal lesions resulted in profound spatial location working memory deficits.
    • Lesions of the prelimbic and infralimbic cortex (MPF subregions) caused profound visual object working memory deficits.

    Conclusions:

    • Different neural subregions within the medial prefrontal cortex (MPF) are specialized for processing distinct types of working memory information.
    • The MPF plays a critical role in spatial response and, to a lesser extent, spatial location working memory.
    • The prelimbic and infralimbic cortex are essential for visual object working memory.