EEG correlates of finger movements with different inertial load conditions as revealed by averaging techniques

Semyon Slobounov, R. Tutwiler, M. Rearick, John Henry Challis

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Objective: The present study was aimed to further address the general empirical question regarding the sensitivity of EEG correlates toward specific kinematic and/or kinetic movement parameters. In particular, we examined whether adding different inertial loads to the index finger, while a subject produced various amplitudes of discrete finger movements, influenced the movement-related potentials (MRP). Methods: Our experimental design systematically controlled the angular displacement, velocity and acceleration (kinematic) profiles of finger movement while torque (kinetics) was varied by adding different external loads opposing finger flexion movement. We applied time-domain averaging of EEG single trials in der to extract three movement-related potentials (BP(-600 to -500) BP(-100 to 0) and N(0 to 100)) preceding and accompanying 25, 50 and 75°unilateral finger movements with no inertial load, small (100 g) and large (200 g) loading. Results: It was shown that both inertial load and the degree of angular displacement of index finger flexion increased the amplitude of late components of MRP (BP(-100 to 0) and N(0 to 100)) over frontal and precentral areas. In contrast, the external load and movement amplitude manipulations did not influence the earlier component of the MRP (BP(-600 to -500)). Conclusions: Overall, the data demonstrate that adding inertial load to the finger with larger angular displacements involves systematic increase in activation across frontal and precentral areas that are related to movement initiation as reflected in BP(-100 to 0) and N(0 to 100).

Original languageEnglish (US)
Pages (from-to)1764-1773
Number of pages10
JournalClinical Neurophysiology
Volume110
Issue number10
DOIs
StatePublished - Oct 1 1999

All Science Journal Classification (ASJC) codes

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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