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Related Experiment Video

Updated: Feb 3, 2026

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

Published on: November 14, 2018

tDCS modulates behavioral performance and the neural oscillatory dynamics serving visual selective attention.

Timothy J McDermott¹, Alex I Wiesman^1,2, Mackenzie S Mills¹

¹Center for Magnetoencephalography, University of Nebraska Medical Center (UNMC), Omaha, Nebraska.

Human Brain Mapping

|October 29, 2018

Summary

Anodal transcranial direct-current stimulation (tDCS) impaired cognitive task performance and altered brain oscillations. Cathodal tDCS showed no significant effects, suggesting polarity-specific modulation of neural activity.

Keywords:

alpha direct-current stimulation magnetoencephalography oscillation theta

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Last Updated: Feb 3, 2026

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Area of Science:

Neuroscience
Cognitive Science
Brain Stimulation

Background:

Transcranial direct-current stimulation (tDCS) is a noninvasive brain modulation technique.
The precise effects of tDCS on neural oscillations during cognitive tasks are not fully understood.

Purpose of the Study:

To investigate how different polarities of occipital tDCS affect flanker task performance.
To examine the impact of tDCS on underlying neural oscillatory dynamics.

Main Methods:

48 healthy adults received anodal, cathodal, or sham occipital tDCS.
Participants performed a visual flanker task while undergoing high-density magnetoencephalography (MEG).
Time-frequency analysis using beamforming assessed oscillatory responses and neural activity.

Main Results:

Anodal tDCS slowed reaction times and increased theta/alpha band spontaneous activity.
Anodal tDCS reduced prefrontal task-related theta oscillations.
Cathodal tDCS did not significantly alter behavior or neural activity.

Conclusions:

Anodal occipital tDCS modulates cognitive performance and neural oscillations.
Observed effects suggest polarity-dependent modulation of both local and distant brain regions.
Theta oscillation power in prefrontal cortex correlated with reaction time.