The alpha power share term was 70% of the mean 2–30 Hz posterior spectral entropy decrease with closed eyes in 60 adults under symmetric decomposition

An exact symmetric decomposition separated the eye-state change in posterior spectral entropy into alpha share and two shape terms. The analysis used 60 adults, three sessions, and OpenNeuro ds004148 version 1.0.1. Entropy used 113 equal-width bins from 2 to 30 Hz. The alpha group used 8 to 13 Hz. The mean closed-eye minus open-eye entropy difference was -0.1323 normalized units. The alpha share term was -0.0930. It was 70.3% of the mean decrease, with a paired 95% participant bootstrap interval of 67.0% to 73.8%. The planned majority contrast passed. All six fixed sensitivity checks and all three session estimates also passed. The terms are algebraic contributions. Fixed state order and prior open-eye component removal limit interpretation. This result does not establish a causal effect or a change in temporal complexity. The package preserves 360 window spectrum files, source metadata and hashes, code, and the local analysis plan. It also preserves all result tables, 10,000 bootstrap draws, figures, and reproduction instructions. Independent entropy calculations and fresh raw EEG replay passed. A second analysis produced identical results.

spectral entropy · EEG · alpha power · eye state · entropy decomposition · bootstrap · reproducibility