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A primacy effect in monkeys when list position is relevant

B Buffalo1, D Gaffan, E A Murray

  • 1University of Oxford, UK.

The Quarterly Journal of Experimental Psychology. B, Comparative and Physiological Psychology
|November 1, 1994
PubMed
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Primates exhibit a primacy effect in visual discrimination learning only when list position is relevant. This effect, observed in Rhesus monkeys (Macaca mulatta), highlights the importance of positional cues in learning tasks.

Area of Science:

  • Cognitive Psychology
  • Primate Behavior
  • Neuroscience

Background:

  • The primacy effect, a cognitive phenomenon where items at the beginning of a list are better recalled, has been extensively studied in humans.
  • Its presence and underlying mechanisms in non-human primates, particularly in visual discrimination learning, remain less understood.

Purpose of the Study:

  • To investigate the occurrence of the primacy effect in Rhesus monkeys (Macaca mulatta) and Cynomolgus monkeys (M. fascicularis).
  • To determine if the relevance of list position to discrimination performance influences the manifestation of the primacy effect.

Main Methods:

  • Experiment 1 involved monkeys learning visual discriminations where list position determined reward (e.g., Stimulus A rewarded at Position 1).
  • Experiment 2 involved monkeys learning visual discriminations where list position was irrelevant to reward, with stimuli consistently rewarded regardless of position.

Related Experiment Videos

Main Results:

  • A significant primacy effect was observed in Experiment 1 when list position was relevant to discrimination performance.
  • No primacy effect was detected in Experiment 2 when list position was irrelevant to discrimination performance.

Conclusions:

  • This study provides the first evidence of a primacy effect in visual discrimination learning in monkeys.
  • The findings suggest that the primacy effect in this context is contingent upon the relevance of list position cues to the learning task.