Abstract
In this study, a new hat-type electroencephalogram (EEG) device with candle-like microneedle electrodes (CMEs), called an EEG-Hat, was designed and fabricated. CMEs are dry EEG electrodes that can measure high-quality EEG signals without skin treatment or conductive gels. One of the challenges in the measurement of high-quality EEG signals is the fixation of electrodes to the skin, i.e., the design of a good EEG headset. The CMEs were able to achieve good contact with the scalp for heads of different sizes and shapes, and the EEG-Hat has a shutter mechanism to separate the hair and ensure good contact between the CMEs and the scalp. Simultaneous measurement of EEG signals from five measurement points on the scalp was successfully conducted after a simple and brief setup process. The EEG-Hat is expected to contribute to the advancement of EEG research.
Highlights
Electroencephalography (EEG) is a method used for measuring electrical potential fluctuations originating from neural activity in the brain
These results indicate that for the candle-like microneedle electrodes (CMEs) to achieve an impedance that was sufficient for good measurement performance, it was necessary to separate the hair until the hair occupancy ratio was below 80%
Given that an impedance of approximately 100 kΩ is sufficient for EEG measurements with dry-electrodes, including CMEs [52], for the EEG measurements with the EEG-Hat, it was not necessary to press the electrodes until the participants felt discomfort when the hair was properly separated by the shutter
Summary
Electroencephalography (EEG) is a method used for measuring electrical potential fluctuations originating from neural activity in the brain. Some applications require an even smaller number of measurement sites, which we consider is likely to become a mainstream requirement when EEG is used daily for BCI or the monitoring of the user’s mental or vital state. The pillar at the base allows the electrodes to avoid hair, which enables successful EEG EmEeGasmureeamsuenretsmfernotms frtohme sthcaelpsca[1lp9–[2119]–.21T]h. The lead wire is connected to the electrode via the inside of the insertion part, which prevents the lead wire from hindering the movement of the shutter and contacting the electrode to the scalp This was not the case for our prior work [46], where the design resulted in a low measurement yield and long setup time. Thhatefhoarttwheasatdtaecshigmneendtaonfdthperomvoiddeudlebsy, aanhdatthmeahkoelre(sDouble were loRcaibtebdonatCaop.pLrotdx.i,mTaotkelyyoF, 4Ja, pFa3n, )C. zT,hOe2re, awnedreOf1ivine thhoeleins tienrnthaetiohnaatlf1o0r–t2h0e saytstatecmhm. ent of the modules, and the holes were located at approximately F4, F3, Cz, O2, and O1 in the international 10–20 system
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