Muse S Athena EEG, PPG and webcam recordings with ECG reference and documented sensor failures

Recordings from a Muse S Athena headband (4-channel EEG at 256 Hz; optical heart sensor, PPG, at about 64 Hz with 4 or 16 channels), a webcam (mean face colour at about 30 Hz, no video) and a Galaxy Watch7 single-lead ECG at 500 Hz. Two adults made them while developing an adaptive learning platform. The included README documents real device failures found in the recordings and where each occurs: six whole-device dropouts, caused by walking out of Bluetooth range and by switching the headband off, with EEG and PPG recorded together in one file; poor electrode contact; mains interference that the headband’s own contact grade missed; a noisy EEG channel; bursty Bluetooth delivery and timestamp jitter; a heart-rate estimate that locked onto step rhythm during exercise; webcam heart-rate errors against ECG. For each dropout, the README gives the outage length (10.8 to 38.4 s), whether samples were lost or delivered late (lost), and how quickly electrode contact recovered (3.4 to 4.0 s). Two recordings at 16 optical channels show a strained link that held without dropping. Contents: 3 dropout recordings (7 to 15 min), 3 raw EEG recordings (4 to 9 min), 2 EEG score recordings, 6 PPG recordings (1 to 8 min), 2 webcam recordings, and 12 ECG readings of 30 s each. Files are gzipped JSON Lines and CSV, and the README gives a pandas loader for each file type. Released under CC BY 4.0. Please cite the dataset when using it. Do not attempt to identify the wearers.