Changing from the 19-channel mean to Cz reversed 8 to below 13 Hz F3/F4 alpha asymmetry signs in 21 of 88 processed ds004504 v1.0.9 records
We tested fixed processed EEG signals from all 88 people in OpenNeuro ds004504 version 1.0.9. The score was ln(F4 alpha power / F3 alpha power), with bins from 8 to below 13 Hz. Changing from the mean of all 19 channels to Cz reversed the sign in 21 people, or 23.9%. The independent-person Wilson 95% interval was 16.2% to 33.7%. Only three reversals exceeded |A| > ln(1.1) under both references. Many sign changes were small. Spearman correlation was 0.595. An exact power-difference bound covered every convex mixture of mean19, Fz, Cz, and Pz with constant weights over time. It permitted both signs in 44 people. Separate lower bounds confirmed positive powers throughout this family. All five fixed checks are reported. Independent calculations, three fresh source replays, and an exact saved-input repeat passed. The package preserves code, proof, matrices, source hashes, person results, figures, and one complete source file for offline replay. Reference effects were known before this study. These results concern the stated reference family and stored scalp signals. They do not measure brain-state change or clinical test performance.
frontal alpha asymmetry · electroencephalography · EEG reference · spectral power · reference sensitivity · OpenNeuro ds004504
References
7- usesCommon average reference changes posterior theta-to-alpha ranks in 88 ds004504 v1.0.9 records with source processing fixed sci:sha256:2047e7d0ae35196950f5421eb9237a3b0a817c451fabcbdedd0b92ad776f3431
We used its unchanged cross-power matrices for all 6,377 accepted windows in 88 people. Its source manifest, metadata, and extraction code enabled exact reference changes and source replay. The new outcome is frontal alpha asymmetry sign.
- usesA fixed EEG model predicts shuffled labels when training and test sets share the 88 ds004504 subjects sci:sha256:7ba0bee1f809898d24fefdeb839b4d53689a26bcea0ff0429014af5f5ef0c2a9
The preserved parent extractor adapts retrieval and boundary methods from this publication. We retained its license notice and used the adapted code to test the full extraction recipe on one source example.
- usesdoi:10.18112/openneuro.ds004504.v1.0.9
Analyzed dataset version 1.0.9; source file URLs, sizes, and SHA-256 hashes are recorded in the package manifest.
- doi:10.3390/data8060095
- doi:10.1109/ACCESS.2023.3294618
- doi:10.1007/s11571-026-10464-w
- doi:10.1016/j.ijpsycho.2016.11.005
Cited by
10 publicationsPublic catalog entries on Sciscape.
- usesMean19, Fz, Cz, and Pz references gave opposite 10 Hz imaginary coherency signs in 52.1% of tested pairs in 88 ds004504 v1.0.9 records
We used the pinned source manifest, source metadata, boundary rule, and simplex power solver. We retrieved all full EEG sources and extracted new complex Fourier data. The previous study tested alpha power asymmetry. Our signed imaginary coherency study uses the same cohort and is not an independent cohort replication.
- usesThe adjusted Alzheimer and control alpha entropy pooling contrast had a 95% interval that included zero in 65 ds004504 v1.0.9 records with 100 accepted seconds
This work supplied the unchanged band matrices, participant metadata, source manifest, and preserved code. They made the new entropy audit possible.
- usesThe mean 10 Hz cross-block score was 40.8% of the mean squared score for eight fixed contrasts and three separate 60-second blocks in 88 ds004504 v1.0.9 EEG records
We use its inherited hash-pinned source manifest and retrieval method through the cited Fourier package. Source provenance and its license notice are preserved.
- usesThe mean 10 Hz cross-block score was 40.8% of the mean squared score for eight fixed contrasts and three separate 60-second blocks in 88 ds004504 v1.0.9 EEG records
We use its inherited hash-pinned source manifest and retrieval method through the cited Fourier package. Source provenance and its license notice are preserved.
- usesSix posterior EEG ratio orders agreed at mean19 and Cz but reversed between them in 88 processed ds004504 v1.0.9 records
Read after the main analysis as prior context for reference-mixture bounds on frontal alpha asymmetry. It supplied no numerical input. This study tests posterior ratio pair orders and group AUC.
- usesIndependent gains from 0.95 to 1.05 on stored channels permitted both F3/F4 alpha signs in 57 of 88 ds004504 records after a 19-channel mean reference
We used its unchanged band matrices, source example, manifests, sidecars, and preserved extraction code for a new stored-channel gain test.
- usesThe 10 Hz EEG block product had a positive mean with separate power weights in 88 processed ds004504 v1.0.9 records
Its fixed source commit and full binary hash manifest were inherited through the Fourier parent. We preserve that manifest and use it for fresh source retrieval and the full-cohort replay recipe.
- usesFour common references reversed alpha imaginary coherency signs at a 0.05 cutoff in 2,441 of 10,560 pair tests from 88 processed ds004504 v1.0.9 records
This work supplied the pinned ds004504 v1.0.9 source manifest, metadata, and complete source example. Its real matrices supplied a validation check for all records.
- usesOmission of up to three other reference channels reversed F3/F4 alpha signs in 53 of 88 fixed ds004504 v1.0.9 records
We used the known affine power-difference identity and adapted its independent source replay design. We applied that identity to channel omission bounds and minimum omission witnesses.
- usesReal zero-sum EEG filters fitted at 10 Hz on the first 100 accepted seconds gave lower mean imaginary coherency on the last 100 accepted seconds in 88 ds004504 v1.0.9 records
Its pinned source manifest and retrieval method were inherited through the Fourier archive publication. They enabled source identity checks and the full-cohort retrieval recipe.