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Prospective memory in the rat.

A George Wilson1, Jonathon D Crystal

  • 1Department of Psychology, University of Georgia, Athens, GA 30602-3013, USA.

Animal Cognition
|September 17, 2011
PubMed
Summary
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Rats demonstrate prospective memory, a future planning ability. This memory function selectively impairs ongoing tasks when accessed, but not when inactive.

Area of Science:

  • Cognitive Neuroscience
  • Animal Behavior

Background:

  • Prospective memory involves forming future action representations, temporarily inactivating them during other tasks, and activating them later.
  • A key characteristic of prospective memory is its detrimental effect on concurrent activities upon activation.
  • While scrub jays and non-human primates show future planning, this capacity in rats is less understood.

Purpose of the Study:

  • To investigate whether rats possess prospective memory capabilities.
  • To determine if prospective memory in rats selectively impairs ongoing task performance during memory access.
  • To differentiate prospective memory effects from other potential performance decrements like fatigue or attentional limits.

Main Methods:

  • Rats were trained on a 90-minute temporal bisection task daily.

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  • Following the task, one group received an 8g meal, while a control group did not.
  • Performance sensitivity to time within the bisection task was measured for both groups.

    • Main Results:

    • The meal group, which presumably accessed prospective memory, showed reduced time sensitivity as the 90-minute interval progressed.
    • The no-meal group did not exhibit this reduction in time sensitivity.
    • The observed deficit was not attributable to response competition, attentional limitations, anticipatory contrast, or fatigue.

    Conclusions:

    • Rats exhibit prospective memory, evidenced by a selective performance deficit in an ongoing task.
    • This deficit occurs specifically when the prospective memory representation is accessed, not when it is inactive.
    • The findings suggest rats possess a form of future planning akin to prospective memory found in humans and other species.