Fig. 7. Odor-aversion learning of the slugs with IT amputation, using a shading box. (Ai) Experimental schedule of the pre-conditioning control treatment or IT amputation. (Aii) The avoidance rate (%) of the slugs with the pre-conditioning control treatment. (Aiii) The avoidance rate (%) of the slugs with the pre-conditioning IT amputation. (Bi) Experimental schedule of the post-conditioning control treatment or IT amputation. (Bii) The avoidance rate (%) of the slugs with the post-conditioning control treatment. (Biii) The avoidance rate (%) of the slugs with the post-conditioning IT amputation. The numbers above the columns indicate the number of slugs used for the retention tests. ^**P<0.01 by ² test.