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Event-based proactive interference in rhesus monkeys.

Deepna T Devkar1, Anthony A Wright2

  • 1Department of Neurobiology & Anatomy, The University of Texas Medical School, Houston, TX, 77030, USA. deepna.85@gmail.com.

Psychonomic Bulletin & Review
|February 11, 2016
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Summary
This summary is machine-generated.

Rhesus monkeys exhibit proactive interference (PI) in memory tasks, where prior stimuli disrupt current recall. Interference depends on the number of intervening trials, not elapsed time, suggesting event-based memory processing.

Keywords:
Long-term memoryMonkeysProactive interferenceSame/differentVisual working memory

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Area of Science:

  • Cognitive psychology
  • Primate behavior
  • Neuroscience

Background:

  • Proactive interference (PI) is a memory phenomenon where prior learning impedes new learning.
  • Understanding PI in non-human primates offers insights into memory mechanisms.
  • Rhesus monkeys were used to investigate PI in a same/different memory task.

Purpose of the Study:

  • To investigate proactive interference (PI) in rhesus monkeys using a same/different memory task.
  • To determine if PI is influenced by the number of intervening trials or elapsed time.
  • To compare PI effects in monkeys with those observed in pigeons.

Main Methods:

  • Three rhesus monkeys performed a same/different memory task with trial-unique pictures.
  • Proactive interference was manipulated by reintroducing prior sample stimuli at varying trial intervals (1, 2, 4, 8, 16 trials prior).
  • Time delays between sample and test stimuli, and intertrial intervals were varied.

Main Results:

  • Greater PI occurred when fewer trials separated the interfering stimulus and the current trial.
  • Time manipulations (delays, intertrial intervals) did not significantly affect PI levels.
  • PI appears to be event-based, depending on the number of intervening trials rather than absolute time.

Conclusions:

  • Rhesus monkeys' PI is primarily driven by the number of intervening events, not elapsed time.
  • This suggests an event-based memory system in monkeys, differing from some interpretations in other species.
  • Novel stimuli elicited greater PI than familiar stimuli, with a surprising accuracy increase when interference was 16 trials prior.