#Eeg headset skin#

In contrast, given that dry electrodes do not require gel application, their signal quality is maintained over longer periods of time.Дry electrode EEG systems have recently been proposed (see 2 for a review and 9, 10, 11 for a comparison of various devices with respect to research applications) as an alternative both for clinical and home monitoring usage, as well as applications in real life situations such as during sports 3, 12, 13. However, for practical concerns, this procedure is even less suitable for home recordings compared to conventional wet electrodes. This technique maintains the signal quality over long periods of time, provided that electrode conductant is periodically refilled 8.

#Eeg headset skin#

For longer recording periods, a modified version of wet electrodes is usually applied, in which the electrodes are glued on the skin using collodion. Regarding the second issue, wet electrodes tend to have reduced signal quality after several hours when the conductive gel dries out, failing to meet the stability of data quality requirement 1, 2, 6, 7. In contrast, wet electrodes may take longer to apply, and their set ups are not well tolerated by patients over longer recording periods in part because of the tension and discomfort exerted by the elastic chin straps that are tightly connected to hold the EEG cap in place. Regarding the first key issue, dry electrodes do not require skin abrasion, gel application, or a trained technician therefore, they might be useful for EEG recording in the home setting. The same standards hold for other applications, including repeated EEG recordings in the context of neurorehabilitation. To achieve reliable home-based EEG recording, electrodes must be easy to apply and provide stable data quality over long recording sessions. However, this presents a barrier to realising diagnostic strategies that propose replacing EEG recordings in the clinic or the doctorвЂ™s office with EEG recordings in the patientвЂ™s home, which saves both time and costs as well as improving the patientвЂ™s health care and comfort 4, 5. Trained EEG technicians are therefore recommended for wet electrode EEG set-up and acquisition (for instance, see 1, 2, 3).

However, EEG recording with wet electrodes requires skin abrasion, gel application, impedance optimization and cleaning after recording, all of which are time consuming. Wet electrodes that rely on conductive gel to guarantee low impedance levels (<10 KOhm) remain the gold standard for clinical recordings.

The quality of scalp electroencephalogram (EEG) recordings critically depends on the connection between the amplifier input and the skin surface. These results suggest that the signal quality, ease of set-up and portability of the dry electrode EEG headset used in our study comply with the needs of clinical applications. However, Theta and Delta power was slightly higher with the dry electrodes (pвЂ‰=вЂ‰0.0004 for Theta and pвЂ‰вЂ‰0.10 in all cases) with a similar spatial distribution for both wet and dry electrode systems. Absolute Alpha and Beta power during rest did not statistically differ between the two EEG systems (pвЂ‰>вЂ‰0.05 in all cases). Both neurologists reported that all rsEEG traces were comparable between the wet and dry electrode headsets. The majority of subjects preferred the dry electrode headset. The P100 visual evoked potential (VEP) and P3 event-related potential (ERP) were compared in terms of latency, amplitude and pre-stimulus noise.

Comparisons of the rsEEG recordings were conducted qualitatively by independent visual evaluation by two neurologists blinded to the EEG system used and quantitatively by spectral analysis of the rsEEG. They reported their preferred EEG system. Each subject took part in two recordings on different days, one with 19 dry electrodes and another with 19 wet electrodes. We recorded the resting state EEG (rsEEG), the visual evoked potentials (VEP) and the visual P300 (P3) from 16 healthy subjects (age range: 26вЂ“79 years) and 16 neurological patients who reported subjective memory impairment (age range: 50вЂ“83 years). However, the question remains whether the signal quality of dry electrode recordings is comparable to wet electrode recordings in the clinical context. Dry electrode electroencephalogram (EEG) recording combined with wireless data transmission offers an alternative tool to conventional wet electrode EEG systems.