Abstract
Changes in responsiveness to food and noxious stimuli were studied in interneurons controlling feeding behaior and in putative command neurons for avoidance behavior after 10–15 paired presentaations of food and electrical shock in the pulmonate snail Helix lucorum L. It was shown earlier 17 that such aversive learning procedure is associative, and the behavioral aversion to the reinforced type of food in intat snails is maintained for at least 21 days, while normal feeding behavior can be evoked by another type of food. Responses to food presentation in the feeding behavior interneurons changed only in pattern after learning procedure, while in the command neurons for avoidance behavior a new spike reaction appeared, which is assumed to be responsible for the behavioral changes. A possible mechanism of a conditioned reaction in the command neurons for avoidance behavior is discussed.
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