Extended Data Fig. 6. Characterization of combined multimodal electrophysiological in-ear sensing capability.
a–b. EEG-only baseline recording of 40 Hz ASSR (a) time series data, and (b) its PSD. c–d. Simultaneous EEG + EOG recording of 40 Hz ASSR (c) time series data and (d) its PSD under eye blinks at 5-s intervals. e–j. Simultaneous EEG + EDA measurement for the same auditory stimulus. The ear-electrode impedance was continuously measured at 10 Hz (e,f), 100 Hz (g, h), and 500 Hz (i,j), with simultaneous EEG and impedance time series data shown in (e,g,i) and the corresponding EEG PSD shown in (f,h,j). The mean and standard deviation of the measured 40 Hz ASSR PSDs across all 3 electrophysiological sensors are represented by solid lines and shaded bands, respectively.