In vivo buccal nerve activity that distinguishes ingestion from rejection can be used to predict behavioral transitions in Aplysia |
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Authors: | D. W. Morton H. J. Chiel |
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Affiliation: | 1. Department of Neuroscience, 301 Biology Building, Case Western Reserve University, 44106, Cleveland, OH, USA 2. Department of Biology, 301 Biology Building, Case Western Reserve University, 44106, Cleveland, OH, USA
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Abstract: | - We are studying the neural basis of consummatory feeding behavior in Aplysia using intact, freely moving animals.
- Video records show that the timing of radula closure during the radula protraction-retraction cycle constitutes a major difference between ingestion (biting or swallowing) and rejection. During ingestion, the radula is closed as it retracts. During rejection, the radula is closed as it protracts.
- We observed two patterns of activity in nerves which are likely to mediate these radula movements. Patterns I and II are associated with ingestion and rejection, respectively, and are distinguished by the timing of radula nerve activity with respect to the onset of buccal nerve 2 activity.
- The association of ingestion with pattern I is maintained when the animal feeds on a polyethylene tube, the same food substrate used to elicit rejection responses. Under these conditions, pattern I is associated with either swallowing or no net tube movement.
- Most transitions from swallowing to rejection were preceded by one or more occurrences of pattern I in which there was no net tube movement, suggesting that these transitions can be predicted.
- Our data suggest that these two patterns can be used to distinguish ingestion from rejection.
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