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Learning: classical and avoidance conditioning the mollusk Pleurobranchaea.

G J Mpitsos, W J Davis

    Science (New York, N.Y.)
    |April 20, 1973
    PubMed
    Summary
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    Marine snails (Pleurobranchaea) can learn new behaviors through classical conditioning. This study shows they can be trained to withdraw from touch or to feed, demonstrating adaptable learning in their nervous systems.

    Area of Science:

    • Neuroscience
    • Animal Behavior
    • Marine Biology

    Background:

    • Marine gastropods like Pleurobranchaea exhibit distinct responses to tactile and chemical stimuli.
    • Naive Pleurobranchaea withdraw from touch but approach food chemicals.

    Purpose of the Study:

    • To investigate classical conditioning of feeding and withdrawal responses in Pleurobranchaea.
    • To determine if learned responses persist and can be demonstrated in isolated nervous systems.

    Main Methods:

    • Classical conditioning paired tactile stimuli (conditioned stimulus) with food chemicals (unconditioned stimulus).
    • Avoidance conditioning paired non-withdrawal from touch with aversive electrical stimulation.
    • Control groups received unpaired stimuli or only one stimulus type.

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    Main Results:

    • Experimental Pleurobranchaea acquired a conditioned feeding response to touch alone.
    • Avoidance conditioning successfully trained subjects to withdraw from touch instead of feeding.
    • Learned responses persisted for up to two weeks and were observable in isolated nervous systems.

    Conclusions:

    • Pleurobranchaea demonstrates robust classical conditioning for both appetitive (feeding) and aversive (withdrawal) behaviors.
    • These learned behaviors are adaptable and can be modified through associative learning.
    • The neural basis for these learned responses is retained in the isolated nervous system, highlighting the plasticity of neural circuits.