Mean bipolar SEEG slope rank agreement was lower between 30–100 Hz and 80–150 Hz fits than between recordings in 24-second samples from 35 HUP participants

We tested how the fitting range changes bipolar SEEG slope ranks. We used two public interictal recordings from each of 35 HUP participants in OpenNeuro ds004100 version 1.1.3. Each recording supplied three fixed 8-second sections. The feature was the negative straight-line slope of log power against log frequency. The fit ranges were 30 to 100 Hz and 80 to 150 Hz, with line harmonics excluded. Mean rank agreement was 0.685 between fitting ranges and 0.912 between recordings on the same pairs. The mean paired difference was 0.227, with a 95 percent participant bootstrap interval of 0.186 to 0.270. All 35 participants had positive differences. Planned checks retained this direction. The mean change in SOZ AUC was 0.062, with an interval of -0.010 to 0.135. The package preserves code, spectra, source versions, hashes, results, and instructions. All 70 spectra rebuilt exactly from pinned public source ranges. The result applies to these short samples and fit definitions. It does not establish a biological aperiodic measure or a preferred clinical range.

stereo-EEG · spectral slope · frequency range · rank agreement · seizure onset zone · measurement methods