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TitleMultichannel EEG with novel Ti/TiN dry electrodes
Author(s)Fiedler, P.
Griebel, S.
Pedrosa, Paulo Eduardo Teixeira Baptista
Fonseca, C.
Vaz, F.
Zentner, L.
Zanow, F.
Haueisen, J.
KeywordsDry electrode
Bioelectric signal
Electroencephalography (EEG)
Multichannel cap
Issue date2015
JournalSensors and Actuators A: Physical
Abstract(s)Research using multichannel electroencephalographic recordings is increasingly characterized by greater numbers of electrodes. With up to 256 silver/silver chloride (Ag/AgCI) electrodes, preparation and electrode placement is time consuming and error prone. We propose a novel type of dry titanium/titanium nitride (Ti/TiN) electrode, integrated into a novel electroencephalography (EEG) cap based on pneumatic-driven mechanisms. The electrodes were characterized electrochemically and comparative biosignal measurements were carried out. In a NaCl solution, the impedance values were between 824 and 54 ohm and the phase values between 52 and 100 at frequencies between 5 Hz and 10 kHz for the Ti/TiN electrodes. For resting-state EEG, and with eye movements, alpha activity, and pattern reversal visual evoked potential (VEP), there were no significant differences between adjacent novel Ti/TiN and standard Ag/AgCI electrodes in 97.2% of the signal episodes investigated. The potential maps for pattern reversal VEP were similar with both types of electrodes. In conclusion, our novel cap system based on Ti/TiN electrodes and pneumatic-driven mechanisms enables completely dry EEG acquisition and can thus potentially replace conventional Ag/AgCI electrodes due to similar signal quality.
AccessRestricted access (Author)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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