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Fig. 8. Scrutiny of a constant-speed approach path towards the predicted point of
impact. (A) Path of falling fly (open circles, calculated projection onto the
plane of the water surface) and of responding fish (filled dot indicates the
head) sampled every 20 ms. For the fish, only every second sample is shown.
(B,C) The corresponding time course of (B) speed and (C) angle. The phase of
rapid turning is shown by grey shading. Three filled dots indicate the speed
determined in the first, second and third interval of 20 ms duration after
take-off. The impact of the fly is indicated by an arrow. Sequence ends with
the catch. In B, speed values report translational speed except for the phase
of turning (grey shading) in which values report only the change of head
position that was due to turning. During translation the speed is
approximately constant. Note that speed could not be estimated better than
about 0.05 m s-1. (C) After an initial turn of about 30°, the
bearing is maintained. A bearing of 0° denotes a course in the orientation
of the scale bar in A (0.1 m).
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