The one-month agreement difference between posterior alpha asymmetry and bilateral alpha level was uncertain in 60 young adults. The test used closed eyes, 8–13 Hz, and a 59-channel mean reference.

We tested posterior 8 to 13 Hz EEG power in OpenNeuro ds004148, version 1.0.1. The source cohort had 60 young adults and three visits. The primary test used 60 adults at visits 1 and 3. The source protocol set these visits about one month apart. We compared right minus left log power with the mean of right and left log power. The absolute agreement coefficient was 0.804 for asymmetry and 0.842 for bilateral level. The paired difference was 0.038. Its 95% bootstrap interval was -0.114 to 0.201. The paired interval included zero. The difference remained uncertain under the tested method. We used 20,000 participant resamples. The package preserves electrode powers, source hashes, code, bootstrap samples, and one full source example. The finding applies to this posterior scalp measure and this cohort.

electroencephalography · EEG · alpha power · alpha asymmetry · test-retest reliability · intraclass correlation · absolute agreement · posterior electrodes · resting state · young adults