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Fig. 5. Example of a withdrawal trial in response to head stimulation. (A)
Silhouettes at three kinematic stages – initiation, transition and end
of withdrawal–are shown. (B) Six electrodes were implanted in pairs
along the length of the body. Asterisk indicates centre of mass. (C) EMG
activity for the electrodes shown in B. Broken lines represent kinematic
stages illustrated in A and are numbered accordingly: (1) initiation, (2)
transition point and (3) end of withdrawal. Compared with tail-stimulation
trials (Figs 6,
8) from the same fish, there is
relatively little muscle activity in response to head stimulation both in
terms of numbers of electrodes active and amplitude of activity. When
comparing figures, note that the scale bar for tail stimulation trials is four
times that of head stimulation trials, further emphasizing the difference in
strength. No muscle activity is present after the initial burst around the
onset of kinematic activity. Scale bar, 0.2 mV.
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