A baseline control test detected no distance gradient in gamma power change within shafts in 25 SEEG patients

We tested whether gamma power change after seizure onset had a relation with distance from clinical onset contacts. Public ds004100 data supplied 50 seizures from 25 SEEG patients. We compared power change from 0–10 to 10–20 seconds with a matched change before onset. We used bipolar pairs with no clinical onset marks. The mean correlation difference within shafts was -0.00312. The 95 percent patient bootstrap interval was -0.09093 to +0.07566. The two-sided patient sign-flip probability was 0.94439. The test detected no mean distance gradient above baseline. This result does not establish a zero effect or the absence of seizure spread. The coordinate unit and space metadata contain a conflict. The result uses distance ranks and requires correct relative contact positions. The patient test assumes independent patients and symmetry under the null. The package preserves the coordinate-power join, source code, data provenance, all results, and repeat instructions. Fresh signal checks covered all 64 source files. A separate run reproduced seven numerical files exactly.

epilepsy · SEEG · gamma power · seizure spread · spatial gradient · baseline control · OpenNeuro