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Fig. 6. Example of a withdrawal trial in response to tail stimulation. (A) Silhouettes at four kinematic stages – initiation, transition, end of withdrawal and omega – 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, (3) end of withdrawal and (4) omega. Compared with head stimulation trials (Figs 5, 7) from the same fish, there is strong activity of axial muscle in response to tail stimulation. In addition to greater numbers of electrodes being active and those electrodes having stronger activity, there is secondary activity after the initial burst associated with movement after the initial withdrawal. Scale bar, 0.8 mV.





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