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Related Experiment Videos

Retroactive interference effects of surprising reward omission on serial spatial memory

W S Terry1

  • 1Department of Psychology, University of North Carolina at Charlotte 28223, USA. wsterry@email.uncc.edu

Journal of Experimental Psychology. Animal Behavior Processes
|October 1, 1996
PubMed
Summary

Reward omission in spatial memory tasks can cause retroactive interference, impairing performance. However, unexpected outcomes during memory retrieval can also enhance task alternation, supporting a differential rehearsal hypothesis.

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Area of Science:

  • Cognitive Neuroscience
  • Animal Behavior
  • Neurobiology of Learning and Memory

Background:

  • Understanding how memory is updated and interfered with is crucial for cognitive science.
  • Retroactive interference, where new information disrupts recall of older information, is a key phenomenon in memory research.
  • Spatial memory, the ability to navigate and remember environments, is fundamental to survival and is susceptible to interference.

Purpose of the Study:

  • To investigate the effects of reward omission on retroactive interference in a serial spatial alternation task in rats.
  • To examine how unexpected outcomes (surprising reward or omission) influence memory retention and performance.
  • To test the differential rehearsal hypothesis of spatial memory.

Main Methods:

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  • Rats performed a serial delayed-alternation task involving forced choices in three successive T-mazes.
  • Reward omission or reward was manipulated during the delay period between forced and free-choice runs.
  • Performance decrements (retroactive interference) and changes in alternation behavior were measured.

    • Main Results:

    • Nonreward during the delay significantly decreased performance compared to reward, demonstrating retroactive interference.
    • Unexpected outcomes in a subsequent maze (surprising reward or omission) caused interference with the retention of the preceding maze's information.
    • Reward omission occasionally led to increased alternation behavior within the specific maze where it occurred.

    Conclusions:

    • Reward omission is an effective method for inducing retroactive interference in spatial memory tasks.
    • The results suggest that unexpected events can disrupt established spatial memories, but may also modulate subsequent behavior.
    • The findings provide support for the differential rehearsal hypothesis, indicating distinct memory processing mechanisms.