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Related Experiment Videos

Improved recognition memory in monkeys following naloxone administration.

T G Aigner1, M Mishkin

  • 1Laboratory of Neuropsychology, National Institute of Mental Health, Bethesda, MD 20892.

Psychopharmacology
|January 1, 1988
PubMed
Summary

Naloxone, a drug, improved visual recognition in macaques at specific doses. Doses between 0.32-3.2 mg/kg enhanced performance, while very low or high doses were less effective or disruptive.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Primate Cognition

Background:

  • The opioid antagonist naloxone is known to affect various cognitive functions.
  • Understanding naloxone's impact on visual recognition is crucial for its potential therapeutic applications.

Purpose of the Study:

  • To investigate the dose-dependent effects of naloxone on visual recognition memory in non-human primates.
  • To determine the optimal dosage range of naloxone for enhancing visual recognition performance.

Main Methods:

  • Five macaques were trained on a delayed nonmatching-to-sample task using unique objects.
  • Naloxone was administered at various doses to assess its effects on task accuracy.
  • Performance was measured by the number of objects correctly recognized.

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Main Results:

  • Four out of five macaques exhibited an inverted U-shaped dose-effect curve for naloxone.
  • A significant improvement in visual recognition was observed with naloxone doses ranging from 0.32 to 3.2 mg/kg.
  • Lower doses showed minimal effects, and the highest dose (10.0 mg/kg) impaired performance.

Conclusions:

  • Naloxone can enhance visual recognition in macaques within a specific dose range.
  • The findings suggest a complex modulatory role of the opioid system in visual recognition memory.
  • Further research may explore naloxone's potential in cognitive enhancement strategies.