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Neuromagnetic correlates of sensorimotor synchronization.

K Müller1, F Schmitz, A Schnitzler

  • 1Heinrich-Heine University, Düsseldorf, Germany. k.mueller@mpipf-muenchen.mpg.de

Journal of Cognitive Neuroscience
|August 11, 2000
PubMed
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This study used magnetoencephalography (MEG) to investigate sensorimotor synchronization. Findings suggest that sensory feedback, not motor commands, is key for accurately timing finger taps with auditory clicks.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Motor Control

Background:

  • Sensorimotor synchronization tasks, like finger tapping to auditory clicks, exhibit a consistent 'negative asynchrony' where taps precede clicks.
  • Despite extensive research, the central neural mechanisms underlying this synchronization error remain poorly understood.
  • The specific sensory or motor events subjects synchronize to are not well-defined.

Purpose of the Study:

  • To investigate the central neural processes involved in sensorimotor synchronization using magnetoencephalography (MEG).
  • To determine the temporal coupling between motor output (tap) and sensory input (click) at the cortical level.
  • To identify which sensory or motor events are critical for maintaining synchronization.

Main Methods:

Related Experiment Videos

  • Eight subjects performed finger-tapping synchronization with an 800 ms interval auditory pacing signal.
  • Magnetoencephalography (MEG) recorded brain activity, time-locked to both auditory clicks and tap onsets.
  • Evoked responses were analyzed using a three-dipole model to localize neural sources in motor (MI) and somatosensory (SI) cortices.

    • Main Results:

    • Neural activity in contralateral primary motor cortex (MI) preceded tap onset by ~77 ms.
    • Two sources in contralateral primary somatosensory cortex (SI) were identified, peaking near tap onset and ~75 ms after.
    • A key SI source was equally time-locked to both taps and clicks, and was triggered by whichever event occurred second, indicating reliance on sensory feedback.

    Conclusions:

    • Central sensorimotor synchronization relies heavily on sensory feedback processing, particularly in the somatosensory cortex.
    • The brain appears to use the most recent sensory event (tap or click) to adjust and maintain temporal accuracy.
    • These findings provide crucial insights into the neural basis of timing and coordination in sensorimotor tasks.