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Evidence for task-dependent memory dysfunction in the aged monkey.

P R Rapp1, D G Amaral

  • 1Salk Institute, La Jolla, California 92037.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 1, 1989
PubMed
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Aged monkeys show significant memory decline in visuospatial and temporal order tasks, but retain object recognition abilities. This suggests prefrontal cortex dysfunction contributes to age-related cognitive impairment.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Primatology

Background:

  • Cognitive aging affects memory functions differently.
  • Neuropsychological studies in non-human primates offer insights into age-related cognitive decline.

Purpose of the Study:

  • To investigate age-dependent memory deficits in rhesus monkeys.
  • To identify specific memory systems vulnerable to aging.
  • To explore the neural basis of cognitive aging.

Main Methods:

  • Evaluated adult and aged female rhesus monkeys on three memory tasks.
  • Assessed visuospatial memory using a delayed response test.
  • Utilized delayed nonmatching to sample (DNMS) for object recognition and temporal order memory.

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Main Results:

  • Aged monkeys were impaired in visuospatial memory with longer delays.
  • Object recognition memory was relatively preserved in aged monkeys.
  • Temporal order memory was significantly impaired in aged monkeys.

Conclusions:

  • Memory functions are differentially susceptible to age-related decline.
  • Prefrontal cortex dysfunction may underlie prominent age-dependent cognitive impairments.
  • Task-specific deficits in aged monkeys help pinpoint neural structures involved in cognitive aging.