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Fig. 2. Saccade-like and smooth tracking during chasing flights of male blowflies.
(A) Top view of a flight trajectory of a fly (black markers) chasing a black
sphere (diameter: 8.3 mm) moving at a speed of 1.25 m s–1 on
a circular track in a horizontal plane (grey line). The position (circle) and
body axis orientation (lines) of the fly are shown every 20 ms. The fly
follows the target for 4 s. (B) Flight trajectory of a fly chasing another fly
in top view, plotted as in A. To allow an easier comparison, i.e. to have the
same direction of target motion, the trajectories in B were vertically flipped
before further analysis. (C,D) Plots of the error angle, (E,F) yaw orientation
and (G,H) angular velocity, vs time for the chase. In order to use
the same time scale in all plots, only the first 740 ms of the chase displayed
in A are shown in C, E and G. The rotational velocity of the dummy target (716
deg. s–1) is indicated by the dotted line in G. All traces
are affected by noise, primarily due to tape jitter
(Boeddeker et al., 2003).
Despite this methodical limitation the yaw velocity peaks due to saccade-like
body rotations are readily visible in H.
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