Window removal tests proved exact posterior alpha maximum bounds in 60 adults with closed eyes using stored spectra

We tested how accepted window removal affects the posterior alpha maximum in 60 adults with closed eyes. We used stored spectra from OpenNeuro ds004148 version 1.0.1. We searched 21 bins from 8 to 13 Hz at the first visit and one month later. At the first visit, a 10% removal limit allowed shifts of at least 1 Hz in 3 of 60 adults. This result used a mean reference across 59 channels. A shift of at least 0.25 Hz was possible in 53 of 60 adults. Of 44 nonzero month differences, only eight kept a strict sign under all allowed window choices. Each visit could lose at most 10% of its accepted windows. Exact integer checks verified all 11,340 candidate tests. No case was unresolved. The package contains spectra, proofs, witness subsets, hashes, code, figures, and retrieval instructions. These tests use outcome powers to choose windows. They show worst-case sensitivity for saved float32 spectra. They do not identify artifacts or neural change.

EEG · individual alpha frequency · window removal · measurement sensitivity · exact verification · test-retest