Higher closed-eye mean alpha power occurred with percentile range overlap in ds004148 and ds007176 under assumed CE/OE eye-state labels

We tested whether higher mean posterior alpha power with closed eyes also gave separate window power ranges. We used 516 saved spectra from OpenNeuro ds004148 and ds007176. The primary sample had 60 people at three visits and 38 people at two visits. Power came from accepted four-second windows in the 8–13 Hz band. The range ran from the empirical 10th to the 90th percentile. Higher closed-eye mean power occurred with range overlap in 88 of 180 pairs and 50 of 76 pairs. The person mean separation gaps were −0.418 dB and −4.054 dB. Their 97.5% person bootstrap intervals were −1.441 to 0.556 dB and −5.497 to −2.620 dB. An exploratory equal-block check in 58 ds004148 people found a lower gap at later recorded times. The CE/OE eye-state meaning in ds007176 is an assumption. Repeated visits are not independent people. The package preserves code, spectra, source hashes, all fixed checks, stored draws, and retrieval instructions. Fresh source replay matched all eight arrays in four selected records. Independent formulas and a second analysis run checked the results.

electroencephalography · alpha power · eyes closed · eyes open · percentile range · test-retest · EEG spectra · window variability