Session 1 calibration gave no clear one-month agreement gain for 2-Hz posterior eye-state ratios in 60 ds004148 adults

We tested whether separate alpha calibration improves repeatability of a posterior EEG power ratio. The source was OpenNeuro ds004148, version 1.0.1. The primary sample had 60 adults. Session 1 closed-eye spectra selected each person's maximum from 8 through 13 Hz. A 2-Hz band used that center in both test sessions. The fixed comparison band was 9-11 Hz. The ratio was 10*log10(closed-eye power/open-eye power), from 280-second spans. Only sessions 2 and 3 entered the agreement test, about one month apart. Agreement ICC was 0.490 for calibration and 0.530 for the fixed band. The paired difference was -0.039, with a 95% bootstrap interval of [-0.107, 0.030]. The direction was uncertain. Both bands had about 4.07 dB root mean square session change. Six planned method checks also had difference intervals that included zero. The package preserves all 360 input spectra, source retrieval hashes, code, measures, random draws, figures, and reproduction instructions. Independent arithmetic checks passed. Two complete source EEG records reproduced exactly. A full offline run reproduced all 12 numerical output files byte for byte. The result applies to this cohort, processing, band rule, and session schedule. It does not establish equivalence.

electroencephalography · alpha power · individual alpha frequency · test-retest reliability · intraclass correlation · calibration · resting-state EEG