Median within-file relative gamma rank agreement exceeds between-file agreement at 64 s under common average reference in 36 SEEG patients

We tested relative gamma power ranks in two public interictal SEEG files for each of 36 HUP patients. We used the first 128 s, a common contact set, and common average reference. At 64 s, median within-file Spearman agreement was 0.945. Median between-file agreement was 0.869. The median paired gap was 0.077 (95 percent patient bootstrap interval, 0.042 to 0.095). The gap was positive in 34 patients. The exact two-sided sign test gave p = 1.94e-8. Between-file agreement increased from 4 to 64 s. The paired median gain was 0.157. All tested reference, band, and epoch power estimator checks had a positive median gap at 64 s. These checks were descriptive. The source does not establish the biological time gap between files. The result concerns power rank agreement. It does not test seizure localization or surgical outcome. The package contains power values for 4,260 contacts, source versions and hashes, code, results, figures, and reproduction instructions.

stereoelectroencephalography · intracranial EEG · relative gamma power · rank agreement · power estimation · epilepsy