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Fig. 8. Speed vs steadiness. (A) Time courses of center of mass (COM)
speed shown for individual flies. Time courses are aligned so that lift-off
occurred at 0 ms, and individual time courses end when the fly left the field
of view of our cameras. The bar plot at the right indicates the COM speed
(mean ± s.e.m.) for all flies over the first 2 ms of flight (grey
region). (B) Time courses for steadiness (S) shown for individual
flies. Steadiness was calculated from angular speed as described in the text,
with large S-values corresponding to low angular speeds. Bar plots
show steadiness (mean ± s.e.m.) over the first 2 ms of flight as in A.
Voluntary (Vol.) trials are shown in blue, escape (Esc.) trials in red. Mean
COM speed and steadiness are significantly different between voluntary and
escape conditions,
P
0.001, ANOVA.
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