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Fig. 1. Experimental design. (A) Fly orientation was determined at 564 Hz by a
near-IR camera and custom software, which was used to modify the visual
stimulation presented on a 32x64 cylindrical array of LEDs. N, magnetic
north; S, south. (B) Flies were glued to a steel pin, which was placed in a
magnetic field such that they could rotate only about their functional yaw
axis. (C) Manipulation of visual feedback during saccades. When the realtime
software detected the initiation of a saccade, the striped visual stimulus was
rotated by 40° in 80 ms (gray box). The blue trace shows the fly's
observed orientation; the green trace shows the angular position of the
striped pattern. (D) Post hoc calculation of saccade dynamics.
Saccade duration was the time during which the fly's angular velocity exceeded
one-quarter of its maximum value during the saccade. Saccade amplitude was the
difference between the median of the orientation measurements taken in the 50
ms immediately before and after the saccade.