Fig. 3. Rotational optomotor responses are enhanced and expansion-avoidance optomotor responses are suppressed under the influence of attractive odor. (A) Example raw WBA responses evoked by five rotation and expansion stimuli either in the presence of odor (red) or without odor (blue). (B) Odor increased the mean amplitude of rotational optomotor responses but decreased the mean expansion amplitude (N=46, ^*P<0.05, ^**P<0.01, paired t-test). (C) This is the same as (B) but separated by each one-second visual-stimulus presentation. There was no significant time-course effect (two-factor repeated measures ANOVA, odor P<0.05, time P>0.05). Note: within-subjects design eliminates the need for error bars. R/R_max is the normalized response magnitude (see text for details).