PMC5640391_01
(A) EMG activity in the abnormal startle response evoked by unexpected acoustic stimulation. Each trial was started at the point of acoustic stimulation. EMG activity was first seen in the SCM muscle and followed by orbicularis oculi, masseter, biceps brachii, rectus abdominis, tibialis anterior, and abductor hallucis muscles. All traces reflect single trial. (B) EMG records of the startle response elicited by unexpected acoustic stimulation. Responses are not habituated after repeated stimulations.. Abbreviations: EMG, electromyographic; SCM, sternocleidomastoid.
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f1-ndt-13-2581
Simultaneous electromyographic (EMG) recordings showed an early contraction in sternocleidomastoid muscle, followed by slow recruitment of limb muscles in a rostrocaudal order (Figure 1A). There was no habituation on reflex motor responses to repeated stimulation (Figure 1B).