Posterior 8-13 Hz log power during mental subtraction was more repeatable than its resting contrast over one month in 59 adults

The study used OpenNeuro ds004148 version 1.0.1. It tested posterior 8-13 Hz log power during mental subtraction with closed eyes. The primary test used 280-second segments from 59 young adults at two sessions one month apart. Task log power had a single-measure absolute agreement coefficient, ICC(A,1), of 0.791. Task log power minus closed-eye rest log power had ICC -0.047. The paired difference was 0.838. Its 95% person bootstrap interval was 0.276 to 1.203. All seven planned checks gave positive differences. One person strongly affected the contrast estimate. Its wide interval does not establish zero population agreement. Task order changed across sessions, and many final answers were marked incorrect. The study tests score agreement in this protocol. It does not test a causal task effect. The package preserves 358 spectrum files, code, source hashes, quality scores, all bootstrap results, verification, and a raw data retrieval recipe. Two fixed source objects had incomplete binary layouts and were excluded. The plan was local and was not an external registration.

EEG · mental subtraction · resting state · alpha power · test-retest reliability · intraclass correlation · absolute agreement · bootstrap · OpenNeuro