Mean absolute one-month change in the posterior 8–13 Hz maximum was 0.379 Hz larger with open eyes in 60 ds004148 v1.0.1 adults under a 280-second rule

We tested eye state and change in a posterior EEG band maximum. We used all 60 adults in OpenNeuro ds004148 v1.0.1. The primary rule used 280 seconds, the average59 reference, mean accepted window power, and the largest 8–13 Hz bin. Mean absolute one-month change was 0.692 Hz with open eyes and 0.313 Hz with closed eyes. The paired difference was 0.379 Hz. Its 95% interval was 0.175–0.604 Hz from 20,000 person bootstrap samples. Six planned method checks also gave positive differences, with interval lower bounds above zero. A check that excluded three people with band-edge maxima gave 0.281 Hz (0.114–0.452 Hz). Known prior results from these people informed the local plan. This is an extension on the same sample. The forced maximum does not test whether an alpha oscillation exists. Frequency variation combines state change and estimation variation. Fixed state order and prior state-specific processing limit causal claims. The package preserves all 360 input spectra, person results, uncertainty draws, code, source hashes, metadata, and a full retrieval recipe. Independent calculations verified all primary peaks and bootstrap draws. A full offline rerun reproduced all numerical outputs. Four source EEG files passed hash checks, and all rebuilt arrays matched exactly.

EEG · test-retest reliability · alpha frequency · absolute change · eye state · OpenNeuro