Fig. 14.

Wearable flexible devices: functional integration. a Compatibility of TTE with MEG. Reproduced with permission [196].

Copyright 2020, Springer Nature. b Left: Schematic diagram of EEG signal monitoring. Right: EEG signals recorded with corresponding spectrogram in the eyes-closed state. Reproduced with permission [197]. Copyright 2024, John Wiley and Sons. c Top: Impedance map at 1 kHz for all electrodes on the subject's head. Bottom: a 3-T clinical scanner. Reproduced with permission [198]. Copyright 2021, The American Association for the Advancement of Science. d Left: Contact analysis and EEG signal recording. Right: The SEM images of the AgPMS. Reproduced with permission [199]. Copyright 2019, American Chemical Society. e Top: Design of in-ear bioelectronics. Bottom: Schematic diagram of the cocktail effect experiment based on SpiralE. Reproduced with permission [9]. Copyright 2023, Springer Nature. f Left: Experimental setup for EEG acquisition and drowsiness labeling. Right: Earpiece assembly and fit. Reproduced with permission [28]. Copyright 2024, Springer Nature