Across-muscle coherence is modulated as a function of wrist posture during two-digit grasping

Mark Jesunathadas, Juan Laitano, Thomas M. Hamm, Marco Santello

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The purpose of this study was to investigate the extent to which correlated neural inputs, quantified as EMG-EMG coherence across intrinsic and extrinsic hand muscles, varied as a function of wrist angle during a constant force precision grip task. Eight adults (5 males; mean age 29 years) participated in the experiment. Subjects held an object using a two-digit precision grip at a constant force at a flexed, neutral, and extended wrist posture, while the EMG activity from intrinsic and extrinsic hand muscles was recorded through intramuscular fine-wire electrodes. The integral of z-transformed coherence computed across muscles pairs was greatest in the flexed wrist posture and significantly greater than EMG-EMG coherence measured in the neutral and extended wrist posture (. P<. 0.01 and 0.05, respectively). Furthermore, EMG-EMG coherence did not differ statistically between the extrinsic and intrinsic muscle pairs, even though it tended to be greater for the extrinsic muscle pair (. P≥. 0.063). These findings lend support to the notion of a functional role of correlated neural inputs to hand muscles for the task-dependent coordination of hand muscle activity that is likely mediated by somatosensory feedback.

Original languageEnglish (US)
Pages (from-to)68-71
Number of pages4
JournalNeuroscience Letters
Volume553
DOIs
StatePublished - Oct 11 2013

Keywords

  • Coordination
  • Electromyography
  • Force
  • Hand

ASJC Scopus subject areas

  • Neuroscience(all)

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