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Related Experiment Video

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Prestimulation phase predicts the TMS-evoked response.

Bornali Kundu1, Jeffrey S Johnson2, Bradley R Postle3

  • 1Medical Scientist Training Program and the Neuroscience Training Program, University of Wisconsin-Madison, Madison, Wisconsin; bkundu@wisc.edu.

Journal of Neurophysiology
|July 11, 2014
PubMed
Summary
This summary is machine-generated.

Brain oscillations

Keywords:
electroencephalographyexcitabilityphasepowertranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • Prestimulation oscillatory phase and power influence perception of stimuli.
  • These effects may relate to cortical excitability.
  • The impact of oscillations on the brain's electrical response to TMS is unknown.

Purpose of the Study:

  • To investigate if prestimulation phase and power influence TMS-evoked brain responses.
  • To examine this using a combined TMS-EEG approach.
  • To understand TMS interaction with ongoing brain activity.

Main Methods:

  • Combined transcranial magnetic stimulation (TMS) and electroencephalography (EEG).
  • TMS applied to the superior parietal lobule during a memory task.
  • Analysis of prestimulation phase and power effects on TMS-evoked responses.

Main Results:

  • Prestimulation phase, especially in the beta band (15-25 Hz), predicted TMS-evoked global mean field amplitude variations.
  • No significant relationship was found between prestimulation power and TMS-evoked responses.
  • TMS-evoked beta band power fluctuated with prestimulation beta band phase, differing from spontaneous activity.

Conclusions:

  • Fluctuating neuronal oscillation phases create "windows of excitability" in the brain.
  • This provides insight into how TMS interacts with ongoing brain activity on a pulse-by-pulse basis.
  • The findings highlight the role of oscillatory phase in modulating neural responses to stimulation.