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Related Experiment Videos

Retrograde amnesia in praying mantis after two successive learning processes.

N A Zabala1, H Maldonado

  • 1Departmento de Biología de Organismos, Universidad Simón Bolívar, Caracas, Venezuela.

Acta Cientifica Venezolana
|January 1, 1990
PubMed
Summary

Mantis memory consolidation shows that attack-avoidance learning aids memory retention. However, deimatic reaction avoidance memory is lost when trained second, indicating retrograde amnesia in Stagmatoptera biocellata.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Insect Cognition

Background:

  • Memory consolidation is crucial for learning and survival.
  • Understanding memory interference and amnesia provides insights into cognitive processes.
  • Insects offer a simpler model for studying fundamental memory mechanisms.

Purpose of the Study:

  • To investigate the impact of sequential training on memory consolidation in the mantis Stagmatoptera biocellata.
  • To differentiate between retroactive inhibition and retrograde amnesia in insect memory.
  • To explore the factors influencing memory retention and forgetting.

Main Methods:

  • Two groups of mantises underwent sequential avoidance training: attack (A)-avoidance followed by deimatic reaction (DR)-avoidance, or vice versa.

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  • Memory retention for both A-avoidance and DR-avoidance tasks was assessed after training.
  • The number of attacks during A-avoidance training was correlated with memory loss.

    • Main Results:

    • A-avoidance learning did not impede DR-avoidance learning, and vice versa.
    • A-avoidance memory was fully retained when trained first.
    • DR-avoidance memory retention significantly decreased (71-6%) when DR-avoidance training followed A-avoidance training.
    • Memory loss was linked to the activity (number of attacks) during A-avoidance training, not the learning quantity.

    Conclusions:

    • The forgetting of DR-avoidance memory appears to be retrograde amnesia, not retroactive inhibition.
    • Distracting activity during a subsequent training session can cause amnesia for prior memories.
    • The amnesic effect observed is comparable to that induced by anoxia, suggesting a significant neurological impact.