Fig. 4. Efficiency of successful searches. Mean ± S.E.M. of time to find the odor source (A), net-to-gross displacement ratio (B), walking speed (C) and heading angle with respect to odor source (D). For behaviors in A, C and D, there were no differences in responses of the ablated animals at either shrimp concentration (A,C: ANOVA, P>0.05; D: Watson–Williams test, P>0.05; Zar, 1996). For B, at high shrimp concentration only, there was a significant ablation effect (ANOVA, F_3,30=3.50, P=0.027); ablation conditions whose bars have different letters are significantly different (LSD test, P<0.05).