Equal name group reference weights reduced mean beta power change after simulated alternate contact loss in two minutes from each of 19 SEEG records

We tested how contact loss from a common reference changes beta power at fixed target contacts. We used two minutes from each of 19 selected public SEEG records in OpenNeuro ds003876 version 1.0.2. We compared an equal contact average with an average that gave each contact name group equal weight. The main test removed alternate contacts from one group at a time. Mean patient RMS power change fell from 0.09967 to 0.01847 dB. All 19 paired patient contrasts were negative. The mean contrast was -0.08120 dB, with a descriptive 95 percent patient interval from -0.11183 to -0.05720 dB. A second test removed a contiguous half in sorted name order. Group weights gave smaller changes in eight patients and larger changes in eleven. The equations show why the effect depends on the surviving group mean. Name groups were possible shaft labels, not verified anatomy. This is a new analysis of a reused cohort. The test measures reference sensitivity, not physiological accuracy or clinical benefit. All 4,222,800 input Fourier coefficients were rebuilt exactly from pinned public EDF ranges. The package preserves inputs, source recipes, code, all results, independent checks, and reproduction instructions.

stereo-electroencephalography · SEEG · common average reference · beta power · contact loss · reference sensitivity · intracranial EEG