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Fig. 2. Spontaneous behavior in the flight arena and methods used to quantify
saccades. (A) Orientation data sampled every 10 ms (101 Hz) reveal periods of
rapid turning (top). The small, slow (
0.5 Hz) oscillations (arrow) were
noticeable by eye, and do not represent tracking noise. The orientation data
were low-pass filtered at 25 Hz before calculating the angular velocity
(bottom). The saccade threshold (broken line) was set 4 s.d. away from 0, at
about 350° s-1. (B) Magnification of the region within the
shaded box from A, containing one saccade. Saccade duration (green lines) was
the time during which the fly's angular velocity exceeded one-quarter of its
peak angular velocity during that saccade (broken line). Saccade amplitude
(blue lines) was the difference between the median of the 5 points before and
after the saccade.
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