tim's journal

Dry Electroencephalography: Reading Brainwaves with Less Pain and Hassle

In conventional electroencephalography (EEG), scalp abrasion and use of electrolytic paste are needed to insure low-resistance between sensor and skin. By replacing this “wet” process with dry sensors, setup and cleanup time are drastically reduced. More importantly, the number and frequency of sessions are no longer limited by the amount of abrasion human scalp can tolerate. However, the unavailability of amplifiers with sufficiently low noise and high input impedance has held back the development of dry EEG sensors until the very recently. While single-sensor comparisons of wet versus dry exist, there has yet to be a multi-sensor study. Our goals are to quantitatively evaluate dry EEG sensors under multi-sensor conditions and to develop specifications for high fidelity recording.

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