Baseline beta selection within shafts gave a +0.007 dB later mean contrast in eight SEEG patients under a fixed model

We tested whether early baseline beta prominence could select pairs with greater later beta suppression. The public SEEG sample had eight patients and 512 trials. Selection used the first 32 baseline spectra per patient. We compared selected and remaining pairs within each shaft on the last 32 trials. The fixed model adjusted beta change for a line fitted to nearby frequencies. The mean later contrast was +0.007 dB. Its 95% patient bootstrap interval was -0.167 to +0.163 dB. The exact two-sided sign-flip p value was 0.953125. Higher baseline prominence persisted on later trials, but the suppression advantage remained uncertain. All five planned sensitivity intervals crossed zero. Inference assumes independent patients; the sign test also assumes null sign symmetry. This analysis reused a clinical cohort and did not target one brain area. The package preserves spectra, raw examples, source pins, code, results, and reproduction instructions. Fresh pinned source extraction matched all eight spectrum files. A clean rerun matched all ten numerical result files byte for byte.

stereoelectroencephalography · SEEG · beta oscillations · spectral prominence · baseline selection · intracranial EEG · periodogram · patient bootstrap