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A Real-Time Phase-Locking System for Non-invasive Brain Stimulation.

Farrokh Mansouri1, Peter Fettes2, Laura Schulze2

  • 1Institute of Biomaterial and Biomedical Engineering, University of Toronto, Toronto, ON, Canada.

Frontiers in Neuroscience
|December 19, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a closed-loop brain stimulation system that analyzes EEG in real-time to deliver precisely timed pulses. This phase-locked stimulation aims for more consistent effects in treating neurological disorders.

Keywords:
closed-loop brain stimulationphase-locked brain stimulationreal-time phase trackingsynchronized brain stimulationtranscranial electric stimulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Neuromodulation

Background:

  • Non-invasive brain stimulation is increasingly used for neurological and neuropsychiatric disorders.
  • Current 'open-loop' methods show variable effects due to lack of real-time brain activity feedback.
  • Closed-loop, phase-locked stimulation offers potential for enhanced potency and consistency.

Purpose of the Study:

  • To introduce a novel closed-loop brain stimulation system.
  • To enable real-time EEG analysis and phase prediction for targeted stimulation.
  • To control pulsed transcranial electromagnetic stimulation (tES/rTMS) at specific brain rhythm phases.

Main Methods:

  • Developed a closed-loop system using EEG, Arduino, and MATLAB.
  • Implemented real-time EEG analysis to forecast brain rhythm phase.
  • Tested phase-locked stimulation in 5 healthy volunteers at specific theta and alpha band phases.

Main Results:

  • Achieved average phase locking values of 0.55° (theta) and 0.52° (alpha).
  • Reported low error angles (11° for theta, 3.3° for alpha).
  • Minimal phase delay (3.8° theta, 57° alpha) accommodated by the algorithm.

Conclusions:

  • The developed system successfully achieves phase-locked brain stimulation.
  • Low-cost hardware implementation is feasible for this technique.
  • Methodology facilitates further research into stimulation phase effects for tES and rTMS.