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Related Experiment Videos

Need probability effects in animal short-term memory.

Rebecca J Sargisson1, K Geoffrey White

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand. rebeccas@psy.otago.ac.nz

Behavioural Processes
|January 28, 2004
PubMed
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Pigeon memory performance, or discriminability, declined when fewer short delays were presented in delayed matching-to-sample tasks. This effect was linked to how reinforcement was distributed, impacting stimulus control.

Area of Science:

  • Cognitive Psychology
  • Animal Behavior
  • Behavioral Neuroscience

Background:

  • The delayed matching-to-sample (DMTS) procedure is a standard method for assessing memory in animals.
  • Need probability theory predicts how reinforcement schedules affect performance in DMTS tasks.
  • Previous research has not fully explored the impact of delay frequency on forgetting functions.

Purpose of the Study:

  • To investigate how the frequency of different delay durations in a delayed matching-to-sample (DMTS) procedure affects memory discriminability in pigeons.
  • To test the hypothesis that changes in reinforcement distribution, rather than delay frequency itself, mediate the observed effects on discriminability.
  • To examine the relationship between reinforcer distribution, stimulus control, and the forgetting function in pigeons.

Main Methods:

Related Experiment Videos

  • Five pigeons were trained on a DMTS task with five delay durations (0.5, 2.5, 5, 10, 20 s) presented across sessions.
  • Discriminability was measured under conditions where delay frequencies were manipulated and when reinforcer probability was adjusted with increasing delay.
  • The number of trials at each delay was held constant in a subsequent manipulation to isolate the effect of reinforcer distribution.

Main Results:

  • Discriminability decreased significantly when sessions contained fewer short delays compared to long delays, contradicting need probability theory predictions.
  • Manipulating reinforcer probability to increase with delay duration produced a similar decrease in discriminability as altering delay frequency.
  • These findings suggest that the distribution of reinforcement plays a crucial role in memory performance.

Conclusions:

  • The frequency of delay durations impacts memory discriminability in DMTS tasks, but this effect is mediated by the reinforcement distribution.
  • Weaker stimulus control, influenced by reinforcer distribution, appears to be the mechanism underlying the observed changes in the forgetting function.
  • Findings challenge simple interpretations of need probability theory and highlight the importance of reinforcement schedules in memory research.