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Related Experiment Video

Updated: Jan 13, 2026

Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography
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Continuous Theta Burst to Supplementary Motor Area Modulates Groove.

Connor Spiech1,2,3, Mario Gómez Martínez4, Giorgio Lazzari5

  • 1Department of Psychology, Concordia University, Montreal, Quebec, Canada.

Annals of the New York Academy of Sciences
|January 9, 2026
PubMed
Summary

The supplementary motor area (SMA) influences our urge to move to music (groove). Disrupting the SMA changed preferences for rhythmic complexity, showing its role in embodied rhythm processing.

Keywords:
continuous theta burstgroovepleasuresupplementary motor areatranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Music Psychology

Background:

  • The urge to move to music, or "groove," is strongest with moderate rhythmic complexity.
  • This phenomenon is linked to temporal predictions from the motor system, balancing expectation and surprise.
  • The supplementary motor area (SMA) is hypothesized to generate these temporal predictions.

Purpose of the Study:

  • To causally investigate the supplementary motor area's (SMA) role in the experience of musical groove.
  • To determine if disrupting SMA activity affects preferences for rhythmic complexity during music listening.

Main Methods:

  • Continuous theta burst stimulation (cTBS) was used to inhibit activity in the left SMA or a control site (V1).
  • Nonmusicians rated musical clips varying in rhythmic complexity and groove before and after stimulation.
  • Participant preferences for rhythmic complexity were assessed post-stimulation.

Main Results:

  • Inhibitory stimulation over the left SMA led participants to prefer music with higher rhythmic complexity.
  • Stimulation over the V1 control site resulted in a preference for music with lower rhythmic complexity.
  • Pleasure ratings for groove were not significantly affected by SMA or V1 stimulation.

Conclusions:

  • The SMA appears to modulate the precision of beat-based predictions within the auditory system.
  • SMA disruption may disinhibit other brain regions involved in generating rhythmic predictions.
  • Findings provide causal evidence for the SMA and V1's critical roles in embodied rhythm processing.