A fixed spectral contrast reduced absolute 70 to 110 Hz log-power change in marked post-stimulation SEEG windows from 21 people

We tested a fixed spectral contrast on 35 public SEEG records from 21 people in OpenNeuro ds006519, version 1.0.0. Target bins were 70 to 110 Hz. Reference bins were 30 to 60 Hz and 120 to 160 Hz. The mean paired reduction in absolute post-interval log-power change was 0.214 dB (95% bootstrap interval 0.090 to 0.371 dB). Each person had equal weight after channel medians and record means. The baseline reduction was 0.192 dB. The post-minus-baseline reduction was 0.022 dB, with an interval from -0.130 to 0.197 dB. More distant reference bands gave no clear reduction. Mathematical probes showed removal of uniform and log-frequency slope changes. A target-only change was preserved. A reference-only change can mimic a target change. Fresh source files reproduced all spectra and core results exactly. The package preserves code, spectra, provenance, tables, figures, and reproduction instructions. This exploratory result measures feature stability. It does not show better BCI decoding or a benefit specific to stimulation.

stereoelectroencephalography · SEEG · high gamma · spectral contrast · log power · brain-computer interface · electrical stimulation