Fig. 2: In vitro validation and characterization of SpiralE.
From: Conformal in-ear bioelectronics for visual and auditory brain-computer interfaces
a Electrochemical impedance spectroscopy (EIS) test results of the five channels in four states (n = 4, mean, error bands: SD). b EIS test results of the five channels during five repeated expansions and deformations (n = 5, mean, error bands: SD). c The decibel values detected by three types of in-ear electronics in task conditions (n = 150, data are presented as mean values +/− SD). d The maximum inner radius of SpiralE during deformation process in a tube. The insets show the status in corresponding stages. e Images of SpiralE expand and deform at complex curvature radii in a right-angle elbow. Scale bars, 3 mm. Source data from (a–d) are provided as a Source data file.
