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Associative memory in three aplysiids: correlation with heterosynaptic modulation.

Brian A Hoover1, Hoang Nguyen, Laura Thompson

  • 1Department of Biology, Chapman University, Orange, California 92866, USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|December 5, 2006
PubMed
Summary
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Evolutionary changes in neuromodulation influence memory stability. This study found that variations in heterosynaptic modulation across three sea-hare species correlate with differences in their classical conditioning memory duration.

Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Marine Biology

Background:

  • Learning and memory research highlights heterosynaptic neuromodulatory signaling.
  • Neuromodulation stabilizes Hebbian synaptic changes, extending memory.
  • Interspecific variation in neuromodulation exists in sea-hares: strong in Aplysia californica, immeasurable in Dolabrifera dolabrifera, and intermediate in Phyllaplysia taylori.

Purpose of the Study:

  • To investigate the correlation between interspecific variation in neuromodulation and memory of associative learning.
  • To compare the temporal patterns of classical conditioning memory across three sea-hare species.

Main Methods:

  • Differential classical conditioning of the tail-mantle withdrawal reflex in three sea-hare species.
  • Mild tail touch paired with noxious neck stimulus (paired), contrasted with mild touch alone (unpaired).

Related Experiment Videos

  • Post-training reflex amplitudes measured 15-30 min after training and compared to pre-test amplitudes.

    • Main Results:

    • All three species exhibited classical conditioning, with the paired reflex increasing more than the unpaired reflex.
    • Aplysia showed modest conditioning that increased over the post-test period.
    • Dolabrifera displayed short-lived conditioning, present only in the first post-test.
    • Phyllaplysia's memory time course was intermediate.

    Conclusions:

    • Interspecific variation in neuromodulation is correlated with differences in the stability of classical conditioning memory.
    • Evolutionary changes in nonassociative heterosynaptic modulation may drive evolutionary changes in memory stability.
    • These findings contribute to understanding the evolution of learning and memory mechanisms.