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Fig. 8. Frequency distributions of adductor muscle electromyogram (EMG) onset
times. There were non-overlapping distributions of adductor muscle onset time
between strike and S-start escape behaviors. Onset of adductor muscle activity
during the startle took place within 5 ms of the initiation of axial activity
while during the strike the delay between axial and cranial activity was
longer and more variable.