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

Chunya Wang, Haoyang Wang, Binghao Wang, Hiroo Miyata, Yan Wang, Md Osman Goni Nayeem, Jae Joon Kim, Sunghoon Lee, Tomoyuki Yokota, Hiroshi Onodera, Takao Someya*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.
Original languageAmerican English
JournalScience advances
Volume8
Issue number20
DOIs
StatePublished - 20 May 2022
Externally publishedYes

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