30 to 80 Hz bipolar slope maps retained mean correlation 0.841 after linear shaft trend removal in paired 60 s files from 33 SEEG patients

We tested bipolar slope maps in two public SEEG files per patient from OpenNeuro ds004100 version 1.1.3. The test used the first 60 seconds of each file and 33 eligible patients. The fit used 30 to 80 Hz, with 55 to 65 Hz removed. We selected 1,799 pairs without shared contacts. After removal of shaft means and linear contact-order terms, the mean patient correlation was 0.841. The patient bootstrap 95 percent interval was 0.804 to 0.877 under independent and exchangeable patient resampling. All 33 patients had positive correlations. All eight fixed descriptive checks also had positive scores in every patient. All 504 arrays rebuilt from 72 pinned raw excerpts matched exactly. The package preserves code, spectra, source versions and hashes, results, bootstrap draws, figures, and reproduction instructions. The files have unknown recording separation. Nonlinear anatomical and recording effects can remain. This result measures file agreement and does not establish a stable neural trait.

stereoelectroencephalography · SEEG · spectral slope · bipolar reference · intracranial EEG · spatial residualization · file agreement