Summed bipolar pairs had no clear excess beta power change disagreement over baseline in 1.5 s SEEG windows after stimulation in 21 patients

We tested beta power changes from summed adjacent bipolar pairs in public SEEG. The source was OpenNeuro ds006519 version 1.0.0. The test used 980 contact triples in 35 records from 21 patients. Each retained window lasted 1.5 seconds. We compared outer span power with the mean power of its two adjacent pairs. Both changes used the same early baseline. Mean absolute disagreement was 0.838 dB after stimulation and 0.829 dB in a later baseline window. The mean excess was 0.009 dB, with a descriptive 95 percent person bootstrap interval from -0.043 to 0.064 dB. The exact person sign-flip reference gave p = 0.745 under null sign symmetry. These data do not show a clear increase over baseline. They do not establish equality or a causal stimulation effect. Change signs differed for 16.84 percent of triples after person averaging in the post window. Only eight of 980 triples had opposite signs with both change magnitudes at least 1 dB. An exact cross-term identity explains the feature difference. All 105 raw source hashes passed. All arrays in 35 records rebuilt exactly. The full analysis replay passed its numeric tolerance. The package preserves data, source metadata, hashes, code, all scores, three figures, and repeat commands. The test is offline, uses post data for one channel exclusion, and has unequal time gaps. Decoder accuracy and stimulation benefit were not tested.

stereoelectroencephalography · beta power · bipolar reference · brain-computer interface · cross term · electrical stimulation