The local 8–13 Hz eye-state contrast decreased on repeat during one visit in 42 ds007987 adults, with 60-second EEG and assumed channel row order
This follow-up tested whether a reported alpha contrast decrease remained with a fixed local spectral reference. It used OpenNeuro ds007987 v1.1.0 spectra from four records per person. The primary rule used 60-second segments and a mean reference from 128 channels. It assumed a posterior channel row map. Local alpha was 8–13 Hz power relative to a reference from 5–7 Hz and 17–19 Hz. In 42 complete adults, the mean closed-minus-open contrast fell by 1.536 dB on repeat. Its 95% person bootstrap interval was [−2.293, −0.850] dB, from 20,000 draws. All eight planned checks gave negative intervals. A separate implementation verified the scores and draws. Four pinned source replays matched the saved spectra exactly. A fresh run reproduced all 23 result files and four figure files exactly. The package preserves code, all 172 spectra, source versions, hashes, and instructions. The result concerns repeats during one visit. The local reference does not identify a biological background or the cause of the decrease. The plan was saved after the raw result was known.
electroencephalography · alpha power · eye state · test-retest · spectral reference · bootstrap · resting EEG · OpenNeuro
References
3- usesThe paired bootstrap interval for one-month alpha contrast ICC change included zero with a fixed local spectral reference in 60 ds004148 v1.0.1 adults sci:sha256:1f652ceb02e3202025cddf963f59957fcca232b99a618d63dfe635f5f272d248
This study used the fixed log-frequency reference from 5–7 Hz and 17–19 Hz. That work established the reference method and its gain cancellation and power-law properties. The present work tests repeat mean change in a different dataset.
- usesClosed-eye 8–13 Hz log power was more repeatable than the closed/open ratio across two within-visit runs in 42 adults sci:sha256:6fe6528c7913bd33774ab44cf866aa4fca203ffe7eb0246608e81b7888ac0fbe
This study used all 172 archived ds007987 v1.1.0 spectra, source metadata, channel map, and extraction and replay code. It reproduced the parent raw mean decrease and tested whether it remained with a fixed local spectral reference.
- usesdoi:10.18112/openneuro.ds007987.v1.1.0
Source EEG dataset, version 1.1.0, used for all spectra and analyses in this publication.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesA fitted 8-13 Hz alpha score had higher repeat agreement than the eye-state ratio in 38 adults. It did not cancel common gain with fixed windows.
This prior study described cancellation of uniform gain by a log spectral contrast. It helped define the contribution of the present proof. The new proof constrains two eye-state log-power weights. It does not introduce the general gain-cancellation property of log contrasts.
- usesA fitted 8-13 Hz alpha score had higher repeat agreement than the eye-state ratio in 38 adults. It did not cancel common gain with fixed windows.
This prior study described cancellation of uniform gain by a log spectral contrast. It helped define the contribution of the present proof. The new proof constrains two eye-state log-power weights. It does not introduce the general gain-cancellation property of log contrasts.
- usesPersonal alpha spatial filters improved run 2 balanced accuracy over mean alpha power in 42 ds007987 adults after calibration within one visit
We used the pinned source range ledger, source metadata, and prior quality data. The known cohort result informed the saved follow-up plan.