A 30–80 Hz SEEG slope score had median onset AUC 0.598 within named shafts under the supplied reference in 34 patients

Can a simple SEEG spectral slope score identify seizure onset contacts within an electrode shaft? We used public OpenNeuro ds004100 data, version 1.1.3. We reused fixed spectra from the first 60 seconds of two interictal files for 36 patients. We compared onset and other contacts on the same named shaft. The primary sample had 34 patients, 90 shafts, and 883 contacts. A larger score meant a steeper spectrum. Under the supplied reference, the 30–80 Hz score had median patient AUC 0.598. The 95 percent patient bootstrap interval was 0.464–0.677. The exact sign test gave P = 0.487: 19 patients were above chance, 14 were below, and one tied. This result does not establish useful onset localization. The median between-file rank correlation on mixed shafts was 0.850. In planned descriptive checks, median AUC was 0.479 at 20–80 Hz and 0.669 at 40–80 Hz. All fits excluded 55–65 Hz. These checks do not select a validated fit range. The package preserves 36 input spectrum files, 51036 scores, all result tables, code, and source retrieval recipes. Separate calculations checked all scores and AUCs. Current raw downloads reproduced one patient's spectra. Eight result files were reproduced exactly. Shaft prefixes, source reference, and record time separation remain limits. The score does not separate spectral peaks or measure excitation and inhibition.

stereo-electroencephalography · SEEG · epilepsy · spectral slope · seizure onset zone · interictal · within-shaft AUC · OpenNeuro