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The in-ear EEG sensor.
Notes: (A) The hardware of the in-ear EEG and the sensor placement inside the external auditory meatus. The length and diameter are the measurements before the insertion. (B) A person wearing the scalp-EEG (C4) and in-ear EEG sensor with corresponding signals. The EEG shows a transition from alpha activity to theta activity during 10 seconds.
Abbreviations: EEG, electroencephalography; GND, ground.
