Effects of background illuminance and panorama contrast on the optomotor responses of WTB flies.

2013-04-09T02:20:20Z (GMT) by Xing Yang Aike Guo

(A) Box plots of the amplitudes of the 0.25 Hz component of the yaw torques recorded from the optomotor response following a single black stripe on a white background (n = 20). The preferred location was in the lower visual field. There was no significant location dependence (p = 0.6653). (B) Box plots of the amplitudes of the 0.25 Hz component of the yaw torques recorded from the optomotor response following single white stripe on a black background (n = 20). The preferred location was in the upper visual field. There was no significant location dependence (p = 0.2625). (C) Data in (A&B) are shown as the mean±SEM. There was significant difference at θ = 20° (p = 0.0066). Blue line, black stripe on a white background; purple line, white stripe on a black background. (D) Box plots of the amplitudes of the 0.25 Hz component of the yaw torques recorded from the optomotor response following single black stripe on a gray background (n = 20). The preferred location was in the lower visual field. There was a significant location dependence (p = 0.0177). (E) Box plots of the amplitudes of the 0.25 Hz component of the yaw torques recorded from the optomotor response following single white stripe on a gray background (n = 20). The preferred location was also in the lower visual field. There was no significant location dependence (p = 0.0798). (F) Data in (D&E) are shown as the mean±SEM. Their distributions were similar for all 9 locations. Blue line, black stripe on a gray background; purple line, white stripe on a gray background. The p values for location dependence were calculated by the Kruskal-Wallis test; significant difference between two groups was judged by the rank-sum test; the red crosses represent outliers; the-y axes of certain charts are truncated for compactness; ** (p<0.01).