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Fig. 3. Body extension ratio and movement during response to head- and
tail-directed stimuli. (A) Examples from three different fish showing the
change in body extension over the duration of response to head-directed
stimuli (dotted line) and tail-directed stimuli (solid line). Start of
response was set at 0 ms, and the extension ratio was measured as distance
between head and tail divided by total body length (BL). Kinematic
landmarks are denoted: transition point (1), end of withdrawal (2) and peak of
omega-like body shape (3). (B) The overall distance in body lengths moved by
the head and the tail during the withdrawal in response to head and tail
stimulation. Also shown is the overall distance moved by the center of mass
during the 48 ms following the withdrawal (post-withdrawal). There is
significantly more post-withdrawal movement of the center of mass in
tail-elicited responses than in head-elicited responses.
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