On-skin paintable biogel for long-term high-fidelity electroencephalogram recording

Author:

Wang Chunya1ORCID,Wang Haoyang1,Wang Binghao1ORCID,Miyata Hiroo1,Wang Yan1ORCID,Nayeem Md Osman Goni1ORCID,Kim Jae Joon1ORCID,Lee Sunghoon1ORCID,Yokota Tomoyuki1ORCID,Onodera Hiroshi1,Someya Takao1ORCID

Affiliation:

1. Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Abstract

Long-term high-fidelity electroencephalogram (EEG) recordings are critical for clinical and brain science applications. Conductive liquid-like or solid-like wet interface materials have been conventionally used as reliable interfaces for EEG recording. However, because of their simplex liquid or solid phase, electrodes with them as interfaces confront inadequate dynamic adaptability to hairy scalp, which makes it challenging to maintain stable and efficient contact of electrodes with scalp for long-term EEG recording. Here, we develop an on-skin paintable conductive biogel that shows temperature-controlled reversible fluid-gel transition to address the abovementioned limitation. This phase transition endows the biogel with unique on-skin paintability and in situ gelatinization, establishing conformal contact and dynamic compliance of electrodes with hairy scalp. The biogel is demonstrated as an efficient interface for long-term high-quality EEG recording over several days and for the high-performance capture and classification of evoked potentials. The paintable biogel offers a biocompatible and long-term reliable interface for EEG-based systems.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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