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Fig. 5. Optomotor responses vary with the vertical extent of pattern motion. (A)
Diagram of visual stimuli. Top row: stimuli used to find the vertical location
of the strongest sensitivity to horizontally moving stripe patterns. Bottom
row: representations of stimuli that vary in vertical stimulus extent. (B)
Response magnitude for a single pixel row of expansion stimuli plotted against
the vertical location of the row in the arena, indicating maximum sensitivity
in the middle of the arena, where the fly is positioned. (C) Mean response
waveforms to visual expansion (top) and visual rotation (bottom) that vary for
the vertical extent of image motion (color coded). Insets indicate responses
to motion restricted to only the front or rear 180° of the cylindrical
arena. (D) Steady-state response amplitude of the waveforms indicated in C for
N=50 flies.
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