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Related Experiment Videos

Rhesus monkeys know when they remember.

R R Hampton1

  • 1Section on the Neurobiology of Learning and Memory, Laboratory of Neuropsychology, National Institute of Mental Health, Building 49, Room 1B-80, Bethesda, MD 20892, USA. robert@ln.nimh.nih.gov

Proceedings of the National Academy of Sciences of the United States of America
|March 29, 2001
PubMed
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Rhesus macaque monkeys can detect when they have forgotten information, demonstrating a parallel with human conscious memory. This ability allows them to selectively avoid memory tests when they lack recall.

Area of Science:

  • Cognitive Neuroscience
  • Animal Behavior

Background:

  • Human memory systems differentiate between conscious and unconscious recall.
  • Documenting conscious memory in nonverbal animals presents significant challenges.

Purpose of the Study:

  • To investigate whether rhesus macaque monkeys possess a functional equivalent of human conscious memory.
  • To determine if nonverbal animals can report the presence or absence of their own memories.

Main Methods:

  • Monkeys were trained to selectively decline memory tests when they had forgotten information.
  • Experimental attenuation of memory was used to validate the monkeys' ability to detect forgetting.
  • Probe tests were employed to exclude environmental or behavioral cueing.

Main Results:

Related Experiment Videos

  • One monkey unequivocally demonstrated the ability to detect and report the absence of memory.
  • The second monkey showed this ability in all but one condition.
  • The monkeys' selective test declination strongly suggests they can discern memory absence.

Conclusions:

  • Rhesus macaques exhibit a functional parallel to human conscious memory by detecting memory absence.
  • This finding challenges the notion that certain memory functions are unique to humans.
  • The results provide objective evidence for metacognitive abilities in nonhuman primates.