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Movement and stimulus preceding negativity.

C H Brunia1

  • 1Department of Psychology, Tilburg University, The Netherlands.

Biological Psychology
|June 1, 1988
PubMed
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Readiness potentials (RPs) over motor areas serve distinct functions. The contingent negative variation (CNV) combines RPs with stimulus-preceding negativity (SPN), indicating separate motor preparation and stimulus anticipation processes.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • Premovement potentials, including readiness potentials (RPs), are crucial for understanding motor control.
  • The contingent negative variation (CNV) is a slow negative wave observed in the electroencephalogram (EEG) preceding a response.

Purpose of the Study:

  • To differentiate the functional roles of readiness potentials (RPs) recorded over various cortical motor areas.
  • To propose that the late wave of the contingent negative variation (CNV) is a composite of RPs and stimulus-preceding negativity (SPN).
  • To investigate the nature of SPN and its potential non-motoric origins.

Main Methods:

  • Analysis of electroencephalogram (EEG) recordings, specifically focusing on premovement potentials.
  • Experimental paradigms designed to elicit and differentiate readiness potentials (RPs) and stimulus-preceding negativity (SPN).

Related Experiment Videos

  • Examination of slow wave distribution and changes in reflex amplitudes.

    • Main Results:

    • Readiness potentials (RPs) recorded over different cortical motor areas appear to reflect distinct functional roles.
    • Evidence suggests the late wave of the contingent negative variation (CNV) is composed of both RPs and a non-motoric stimulus-preceding negativity (SPN).
    • Stimulus-preceding negativity (SPN) was observed preceding at least three different types of stimuli, supporting its role beyond motor preparation.

    Conclusions:

    • Motor preparation and stimulus anticipation are distinct cognitive processes.
    • These distinct processes are reflected in different distributions of slow waves and all-or-none changes in reflex amplitudes.
    • The findings contribute to a refined understanding of the neural mechanisms underlying anticipation and motor preparation.