Soft, curved electrode systems capable of integration on the auricle as a persistent brain-computer interface

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"Recent advances in electrodes for noninvasive recording of electroencephalograms expand opportunities collecting such data for diagnosis of neurological disorders and brain-computer interfaces. Existing technologies, however, cannot be used effectively in continuous, uninterrupted modes for more than a few days due to irritation and irreversible degradation in the electrical and mechanical properties of the skin interface. Here we introduce a soft, foldable collection of electrodes in open, fractal mesh geometries that can mount directly and chronically on the complex surface topology of the auricle and the mastoid, to provide high-fidelity and long-term capture of electroencephalograms in ways that avoid any significant thermal, electrical, or mechanical loading of the skin. Experimental and computational studies establish the fundamental aspects of the bending and stretching mechanics that enable this type of intimate integration on the highly irregular and textured surfaces of the auricle. Cell level tests and thermal imaging studies establish the biocompatibility and wearability of such systems, with examples of high-quality measurements over periods of 2 wk with devices that remain mounted throughout daily activities including vigorous exercise, swimming, sleeping, and bathing. Demonstrations include a text speller with a steady-state visually evoked potential-based brain-computer interface and elicitation of an event-related potential (P300 wave)."
Publisher
NATL ACAD SCIENCES
Issue Date
2015-03
Language
English
Article Type
Article
Keywords

TERM EEG MEASUREMENT; EPIDERMAL ELECTRONICS; DRY ELECTRODE; SKIN; SIGNALS; DEVICES; DESIGN; SENSOR

Citation

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.112, pp.3920 - 3925

ISSN
0027-8424
DOI
10.1073/pnas.1424875112
URI
http://hdl.handle.net/10203/238861
Appears in Collection
EE-Journal Papers(저널논문)
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