Frontal Midline Theta Rhythm and Gamma Activity Measured by Sheet-type Wearable EEG Device

Overview

Journal Front Hum Neurosci

Specialty Neurology

Date 2023 Mar 30

PMID 36992791

Authors

Keita Ueno

Ryouhei Ishii

Masaya Ueda

Takuma Yuri

China Shiroma

Masahiro Hata

Yasuo Naito

Affiliations

Soon will be listed here.

Abstract

Introduction: The current study measured the frontal midline theta rhythm (Fmθ), which appears in the frontal midline region during the attentional focus state, using the sheet-type wearable electroencephalograph (EEG) device HARU-1, and examined the modulation of frontal gamma band activity by cognitive tasks.

Methods: We measured the frontal EEG of 20 healthy subjects using HARU-1 for 2 min during the rest eyes-closed condition and simple mental calculation task condition, respectively. Statistical analyses were conducted using permutation testing based on -test and cluster analysis to compare the results between the resting state and the task condition.

Results: Twelve of 20 subjects showed Fmθ during the task condition. The 12 subjects with Fmθ showed significantly higher activity of the theta and gamma bands, and significantly low activity of the alpha band during the task condition compared to the resting condition. In the eight subjects without Fmθ were significantly low activity of the alpha and beta bands and no significant activity in the theta and gamma band activity during the task condition compared to the resting condition.

Discussion: These results indicate that it is possible to measure Fmθ using HARU-1. A novel finding was the gamma band activity appearing with Fmθ in the left and right frontal forehead regions, suggesting that it reflects the function of the prefrontal cortex in working memory tasks.

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