Journal of Neuroscience, Vol 3, 2621-2628, Copyright © 1983 by Society for Neuroscience
Conditioned modification of locomotion in Hermissenda crassicornis: analysis of time-dependent associative and nonassociative components
T Crow
The contribution of associative and nonassociative factors to the
conditioned modification of phototactic behavior in Hermissenda was
examined after varying the number of conditioning trials and the time
between training and testing. Five or 10 conditioning trials did not
produce significant changes in phototactic behavior when tested immediately
after training. Both 5 and 10 conditioning trials resulted in significant
short-term nonassociative changes in behavior (resembling sensitization)
when the time between training and testing was 15 min or longer. Following
50 conditioning trials (single session training), nonassociative effects
made the major contribution to the change in behavior when the
post-training test interval was 30 min. These nonassociative changes
decremented during a 1-hr period following training. Significant
associative effects were observed 45 min after 50 conditioning trials;
however, significant associative effects were not observed when the same
animals were tested 24 hr after training. With 3 days of training (multiple
session training-150 trials), associative effects were found 30 min after
training and nonassociative effects again showed a rapid decrement during
the 1-hr period following the end of training. The associative effects
observed soon after training were persistent during the retention period
and showed significant effects 24 hr after training. These data indicate
that (1) the behavioral effects found after single session training (5 and
10 trials) are nonassociative, and (2) these nonassociative effects do not
increase significantly over the course of multiple session
training.(ABSTRACT TRUNCATED AT 250 WORDS)
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