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Associative behavioral modification in hermissenda: cellular correlates.

T J Crow, D L Alkon

Science (New York, N.Y.)

|July 18, 1980

Summary

Training Hermissenda crassicornis with paired light and rotation modifies photopositive behavior long-term. This behavioral change is linked to increased activity in type B photoreceptors due to temporal association.

Area of Science:

Neuroscience
Behavioral Biology
Animal Behavior

Background:

Photopositive behavior is crucial for survival in many species.
Understanding the neural mechanisms of associative learning is key to comprehending memory formation.
Hermissenda crassicornis serves as a model organism for studying associative learning and memory.

Purpose of the Study:

To investigate the long-term effects of associative training on photopositive behavior in Hermissenda crassicornis.
To identify the neural correlates of this learned behavioral modification.
To elucidate the cellular mechanisms underlying long-term memory in a simple nervous system.

Main Methods:

Animals were trained for three days using paired trials of light and rotation.

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Spontaneous activity of type B photoreceptors was measured electrophysiologically.

Behavioral changes in phototaxis were assessed after the training period.

Main Results:

Three days of training resulted in a long-term modification of photopositive behavior.
The behavioral modification was dependent on the temporal association between light and rotation.
Increased spontaneous activity in type B photoreceptors correlated with the observed behavioral changes.

Conclusions:

Temporal association of light and rotation induces lasting changes in Hermissenda crassicornis phototaxis.
Type B photoreceptor activity changes are cellular mechanisms underlying this associative learning.
Persistent tonic depolarization of type B photoreceptors explains the observed long-term behavioral and cellular modifications.