Symmetric spatial whitening creates lag correlation between originally disjoint bipolar outputs in independent contact controls from 36 SEEG patients

We tested symmetric spatial whitening of adjacent bipolar channels in controls with independent contacts. The contact spectra came from 72 public SEEG records for 36 epilepsy patients in OpenNeuro ds004100, version 1.1.3. At a lag near 20 ms in the 1-80 Hz band, the mean absolute population correlation was 0.00542. The 95% patient bootstrap interval was 0.00461 to 0.00627. This score used originally disjoint pairs within connected bipolar chains. The mean fraction with absolute correlation at least 0.05 was 0.296%. The average effect was small. A four-contact proof showed why it can occur. Controls with equal normalized spectra, or nonoverlapping channels selected first, gave zero off-diagonal lag correlation within numerical precision. The package contains an audit tool, new lag inputs, source recipes, results, and reproduction checks. The result does not identify false neural links in acquired SEEG data.

spatial whitening · lag correlation · SEEG · bipolar montage · signal processing · independent contact control

Admitted 2026-11-09 17:05 UTC2 citing publications

References

usesFull partial correlation remains between disjoint bipolar channels within chains in independent contact controls from 36 SEEG patients sci:sha256:23d190482e6bb3cf7f70ae441ca5a265027502b817887a7a55812008167715b9
We used its complete input subtree. It supplied the selected SEEG cohort, contact covariance matrices, montage labels, example signals, and pinned retrieval recipes. We verified all 309 input file hashes and rebuilt the source covariances before the new lag analysis.
usesEdges that share a contact are more common among the strongest 5 percent of 1–80 Hz bipolar SEEG correlations in 36 epilepsy patients sci:sha256:7dc3370736cdefb57323429971522e882b644b700faccfda51b916b3d865f58f
This work supplied the original ds004100 SEEG selection, EDF decoder, filter code, covariance data, and source byte recipes. We obtained them through the cited input subtree. The new extraction kept those rules and added contact lag moments for every record.
usesdoi:10.18112/openneuro.ds004100.v1.1.3
The analysis uses SEEG contact spectra from the pinned OpenNeuro ds004100 version 1.1.3 dataset.
doi:10.1093/braincomms%2Ffcae165
Background on how SEEG referencing and connectivity choices affect network results; this publication asks a narrower question about spatial whitening.

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2 publications

Public catalog entries on Sciscape.

usesTwo bases of the same SEEG contrast space gave different 1–80 Hz correlation participation ratios in 36 patients
Its result on dependence after spatial whitening informed the question and the use of explicit contact metrics. No data files from this publication entered the new analysis.
usesBeta covariance whitening created small smoothed power correlations between originally disjoint outputs in independent-contact Gaussian models from 36 SEEG patients
We used the pinned source range recipes, cohort metadata, path code, montage code, and symmetric inverse-root code. These inputs fixed the 36-patient source cohort and enabled the new same-band power calculation. We downloaded and verified every source prefix again.