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Fig. 7. Summary of the electromyographic recordings of S-start strike and startle
muscle activity. The left margin of each bar is mean onset of activity and the
right side is mean offset. Trials were aligned by setting the first onset of
muscle activity to zero. Error bars represent the standard error of onset time
(left) and duration (right). There is no standard error for initial caudal
activity during the strike because this activity was, without exception, the
first activity recorded for the strike. During the strike, initial caudal
activity is followed by rostral and midbody activity on both sides of the
body. Jaw adductor muscle activity is delayed relative to axial activity.
During the startle response, jaw muscle is coactive with contralateral caudal
muscle on one side of the body and rostral and midbody ipsilateral muscle on
the opposite side. The initial activity is immediately followed by ipsilateral
caudal muscle and stage 2 contralateral activity.
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