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

Letizia Mazzini, Marco Schieppati

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

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.

Original languageEnglish
Title of host publicationThe Head-Neck Sensory Motor System
PublisherOxford University Press
ISBN (Print)9780199847198, 9780195068207
DOIs
Publication statusPublished - Mar 22 2012

Keywords

  • Agonist muscle
  • Electromyogram
  • Ipsilateral motor cortex
  • Lateralized stimulus
  • Reaction time
  • Sternocleidomastoid muscle

ASJC Scopus subject areas

  • Neuroscience(all)

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