Dry-Contact Electrode Ear-EEG

Objective: Ear-EEG is a recording method in which EEG signals are acquired from electrodes placed on an earpiece inserted into the ear. Thereby, ear-EEG provides a noninvasive and discreet way of recording EEG, and has the potential to be used for long-term brain monitoring in real-life environments...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 2019-01, Vol.66 (1), p.150-158
Main Authors: Kappel, Simon L., Rank, Mike L., Toft, Hans Olaf, Andersen, Mikael, Kidmose, Preben
Format: Article
Language:English
Subjects:
Adult
Brain
dry-contact biopotential electrode
Ear
Ear, External - physiology
ear-EEG
EEG
Electrodes
Electroencephalography
Electroencephalography (EEG)
Electroencephalography - instrumentation
Environmental monitoring
Feasibility studies
Glass
Humans
Iridium
iridium oxide
Mismatch negativity
Monitoring, Ambulatory - instrumentation
Prosthesis Design
Recording
Scalp
Sensory integration
Signal Processing, Computer-Assisted - instrumentation
Skin
Statistical analysis
Statistical significance
Steady state
Visual evoked potentials
wearable EEG
Wearable Electronic Devices
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Summary:Objective: Ear-EEG is a recording method in which EEG signals are acquired from electrodes placed on an earpiece inserted into the ear. Thereby, ear-EEG provides a noninvasive and discreet way of recording EEG, and has the potential to be used for long-term brain monitoring in real-life environments. Whereas previously reported ear-EEG recordings have been performed with wet electrodes, the objective of this study was to develop and evaluate dry-contact electrode ear-EEG. Methods: To achieve a well-functioning dry-contact interface, a new ear-EEG platform was developed. The platform comprised actively shielded and nanostructured electrodes embedded in an individualized soft-earpiece. The platform was evaluated in a study of 12 subjects and four EEG paradigms: auditory steady-state response, steady-state visual evoked potential, mismatch negativity, and alpha-band modulation. Results: Recordings from the prototyped dry-contact ear-EEG platform were compared to conventional scalp EEG recordings. When all electrodes were referenced to a common scalp electrode (Cz), the performance was on par with scalp EEG measured close to the ear. With both the measuring electrode and the reference electrode located within the ear, statistically significant (p
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.2018.2835778