Fig. 4
From: Remote collection of electrophysiological data with brain wearables: opportunities and challenges
Spectrogram data collected from an EEG consumer wearable. This shows spectrogram data from 2 electrodes of a Muse 2 wearable connected to the Mind Monitor smartphone app (Mind Monitor 2022). Frequencies of EEG waves are shown on the horizontal axis. Time is on the vertical axis starting after zero seconds from the top. Power of the EEG signal for each frequency is encoded by color. Note that color bars are not available in Mind Monitor software so the spectrogram should be interpreted qualitatively. Colors are from high to low power in the following order: red, orange, yellow, green, cyan, blue. A spike in power can be observed earlier in the recording from approximately 0–24 Hz, likely due to an ocular or muscular artifact