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01.02.2014 - Konferenzvortrag: Rapid, dry Multichannel Electroencephalography

P. Fiedler, ANT Burgundy Neuromeeting 2014, Beaune / France

P. Fiedler, S. Griebel, C. Fonseca, F. Vaz, L. Zentner, F. Zanow , J. Haueisen

Application of conventional silver/silver-chloride (Ag/AgCl) electrodes for electroencephalography (EEG) requires accurate, time-consuming individual preparation of each electrode position and application of additive electrolyte materials. The required processes and materials increase patient stress, risk of skin irritation and limit acquisition time as well as acquisition environment. Hence, conventional electrode caps are inappropriate for emerging EEG applications including brain computer interfaces, ambient assisted living and ubiquitous routine monitoring. 

We present a novel, flexible dry-contact electrode technology for simple, rapid application and mobile EEG acquisition. Our electrode concept includes a flexible, compliant electrode polymer substrate, subsequently coated with an electrically conducive layer and integrated into a flexible textile cap system.

Based on a study on multiple volunteers, our results demonstrate the applicability of the novel electrode and cap system. For all volunteers more than 70 % of the electrodes provided impedances below 150 kOhm and sufficient signal quality for EEG acquisition. A further comparison to EEG signals acquired using a conventional wet cap system showed similar signal characteristics in time and frequency domain for an investigated frequency range between 1 and 40 Hz. The compared EEG episodes included spontaneous EEG, alpha activity and a visual evoked potential.

In summary, the electrode substrate and cap textile enable hair layer interfusion, adduction and adaptivity to the individual head geometry. The conductive coating ensures reliable and stable electrochemical characteristics as well as signal quality comparable to conventional electrodes. Thus, we conclude that our novel dry-contact electrodes can potentially replace conventional wet Ag/AgCl electrodes and allow for new fields of application of EEG acquisition and analysis.