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Fig. 1. Apparatus and procedure used in odor-aversion conditioning. (A) A view of a
slug's head and tentacles. (B) The experimental apparatus. Concentric circles
with radii of 45 mm and 15 mm were drawn on black paper, and a glass plate was
superimposed on the paper. This was lit from above. (C) Procedure for
odor-aversion conditioning. (i) Carrot juice (1 ml) was laid on the glass
plate in the shape of the larger circle with a radius of 45 mm. A slug was
placed on the center of the circle. (ii) In the paired conditioning, 1 ml of
quinidine sulfate solution was applied to the mouth of the slug when it was
just about to touch the carrot juice.
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