Figure 7.
Persistence of the changes in radula behavior. A, B, Comparisons of radula cycle rates and rhythmicity in new control, contingent (Cont.), and noncontingent (Non-cont.) groups of animals tested 4 h (A) and 24 h (B) after training. As at 1 h after training (see Figs. 5B, 6B), after 4 h the rate of biting (A1; control vs contingent, q3 = 4.500; noncontingent vs contingent, q2 = 3.988; noncontingent vs control, q2 = 2.659) and the proportions of animals expressing biting rhythmicity (A2) remained significantly higher (p < 0.05) in the contingent group than in either the control or noncontingent groups. By 24 h, however, significant intergroup differences in rate (B1) or rhythmicity of biting (B2) no longer occurred.