Associative hysteresis in larval amblystoma.

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Abstract
Associative hysteresis or true learning is obtained if the response is elicited by a non-essential signal, or a reaction is inhibited by a signal which ordinarily would call it forth. Amblystoma larva formed associations between food taking and movements of the experimenter''s hand above the swimming jar. Similar reactions were made when an intermittent light flashed above the jar. No response was formed to a steady light. The larva learned a single unit T-maze, their correct responses occurring more often than could be accounted for by chance. When an angle worm in a glass bulb was presented several times a learned inhibition of the snap-reflex was established. When the bulb was perforated, so that chemical substances from the angle worm were allowed to escape, more trials were required to establish the inhibition.

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