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The Head-Neck Sensory Motor System$
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Alain Berthoz, Werner Graf, and P. P. Vidal

Print publication date: 1992

Print ISBN-13: 9780195068207

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195068207.001.0001

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Preferential Activation of the Sternocleidomastoid Muscles by the Ipsilateral Motor Cortex during Voluntary Rapid Head Rotations in Humans

Preferential Activation of the Sternocleidomastoid Muscles by the Ipsilateral Motor Cortex during Voluntary Rapid Head Rotations in Humans

Chapter:
(p.597) Chapter 97 Preferential Activation of the Sternocleidomastoid Muscles by the Ipsilateral Motor Cortex during Voluntary Rapid Head Rotations in Humans
Source:
The Head-Neck Sensory Motor System
Author(s):

Letizia Mazzini

Marco Schieppati

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0097

This study aims to readdress the question of voluntary innervation of the sternocleidomastoid (SCM) in man using a simple reaction time (RT) paradigm. The rationale of the study was that the RTs of the agonist muscle should be shorter for rotation toward the stimulus if the pathway was ipsilateral, and shorter for rotations from it if the pathway was crossed. The experiments included the eight subjects with their reaction times being measured on store traces from the onset of the stimulus to the beginning of the SCM electromyogram. The main finding of this study is the demonstrated difference in the RT of the right SCM and the left SCM in response to a lateralized stimulus delivered to the left index finger.

Keywords:   sternocleidomastoid muscle, reaction time, ipsilateral motor cortex, electromyogram, lateralized stimulus, agonist muscle

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