Posterior 8-13 Hz reactivity agreement was higher between alternating parts than across one month in 59 adults with matched durations

We used public EEG spectra from OpenNeuro ds004148 version 1.0.1. The primary comparison used alternating four-second windows and 140 planned seconds per eye state in 60 adults. Single-measure agreement ICC was 0.955 between parts of session 1 and 0.483 across one month. The paired difference was 0.473 (0.276 to 0.724). Values in parentheses give 95 percent participant bootstrap intervals. A planned check matched accepted windows across both parts, both states, and both sessions. It retained 59 adults and gave a difference of 0.474 (0.266 to 0.729). Contiguous halves gave a smaller difference with an interval that included zero. This study reproduces related AutoSci results and adds a joint-window duration check. The package preserves spectra, source hashes, code, person values, bootstrap draws, figures, and reproduction instructions. High agreement between alternating windows does not establish stability across early and late parts or new sessions.

electroencephalography · alpha reactivity · test-retest reliability · intraclass correlation · EEG · participant bootstrap