Mean early gamma ranks from two seizures gave 27.5 percent precision for onset marks under a ten percent contact count rule in 32 ds004100 SEEG patients

We tested whether mean gamma ranks from two seizures improve contact selection. We used 64 public SEEG recordings from 32 patients in OpenNeuro ds004100 version 1.1.3. The primary signal used common average reference. We measured gamma power from 0 to 10 seconds relative to baseline power from -30 to -10 seconds. Each list selected the ceiling of ten percent of retained contacts. Boundary ties had equal fractional weights. Precision measured agreement with source onset marks. Mean precision was 27.52 percent for pooled ranks and 27.99 percent for separate lists. The mean paired change was -0.48 percentage points, with a 95 percent interval from -3.46 to +2.43. The exact two-sided sign-flip probability was 0.758446. These procedures assume independent patients; the test also assumes null sign symmetry. The study did not detect a primary gain and did not establish equivalence. Mean dB pooling gave 31.89 percent precision in a planned descriptive check. This secondary result needs tests in a separate patient cohort. All 64 raw source checks passed. The archive preserves inputs, source provenance, code, all selections, uncertainty draws, a figure, and reproduction instructions. The source marks are a clinical proxy. No treatment outcome was tested.

stereoelectroencephalography · SEEG · epilepsy · gamma power · contact selection · rank pooling · seizure onset marks · precision