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Related Experiment Video

Updated: Mar 26, 2026

Concurrent Electroencephalography Recording During Transcranial Alternating Current Stimulation tACS
06:51

Concurrent Electroencephalography Recording During Transcranial Alternating Current Stimulation tACS

Published on: January 22, 2016

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Concurrent Electroencephalography Recording During Transcranial Alternating Current Stimulation (tACS).

Kristoffer D Fehér1, Yosuke Morishima2

  • 1Division of Systems Neuroscience of Psychopathology, Translational Research Center, University Hospital of Psychiatry, University of Bern.

Journal of Visualized Experiments : Jove
|February 11, 2016
PubMed
Summary

This study details how to successfully record electroencephalography (EEG) during transcranial alternating current stimulation (tACS). Key methods involve using viscous EEG gel and high-resolution analog-to-digital converters to overcome stimulation artifacts.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biomedical Engineering

Background:

  • Oscillatory brain activity underlies cognitive processes and network communication.
  • Transcranial alternating current stimulation (tACS) can investigate the causal role of brain oscillations in cognition.
  • Simultaneous electroencephalography (EEG) recording during tACS is crucial for understanding immediate neurophysiological effects.

Purpose of the Study:

  • To provide guidelines for setting up concurrent tACS-EEG experiments.
  • To address the technical challenges of measuring EEG signals during tACS.
  • To enable researchers to explore the neurophysiological impact of tACS.

Main Methods:

  • Utilizing highly viscous EEG gel to prevent bridging between tACS and EEG electrodes.
  • Employing EEG systems with high-resolution analog-to-digital (A/D) converters to manage large tACS artifacts.
  • Implementing specific procedures and technical considerations for concurrent tACS-EEG setup.

Main Results:

  • Successful concurrent EEG recording during tACS is achievable by carefully managing gel viscosity.
  • High-resolution A/D converters are essential for acquiring quality EEG data near stimulation sites.
  • The tACS artifact magnitude can exceed 100 mV, necessitating appropriate technical solutions.

Conclusions:

  • Proper experimental setup, focusing on gel viscosity and A/D converter resolution, is critical for successful tACS-EEG studies.
  • These guidelines facilitate the investigation of brain oscillations and cognitive functions using tACS-EEG.
  • This methodology advances the understanding of neurophysiological effects of tACS on cognitive processes.