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Fig. 4. Stimulus expansion evokes saccades. (A) The time course of visual
stimulation (stimulus half-angle, red trace), overlaid with the fly's
orientation (black dots). The gray boxes during stimulus expansion and
contraction represent the 500 ms time windows during which a saccade must
occur to be considered `triggered' by the stimulus. The blue box is the time
during which the spontaneous saccade rate was calculated. (B)
Constant-velocity, accelerating and decelerating stimuli all elicit saccades
(N=11 flies). (C) Stimuli expanding along only the horizontal,
vertical or diagonal axes evoke saccades with the same probability as
full-square expansion (N=9). (D) Stimuli approaching with different
constant velocities have equal probability of triggering saccades. Stimuli
with additional expanding edges (concentric squares) also evoke saccades at
the same rate. Contraction of the low-velocity and concentric square stimuli
inhibit the saccade behavior (N=15). *P<0.01;
P<0.05, relative to the spontaneous rate. Total
n=2933 saccades. The error bars represent the s.e.m.; the dotted line
shows the spontaneous probability.
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