Mean beta energy concentration changed by -0.0040 relative to phase controls in four-second SEEG periods from 17 patients

Beta energy can be spread over time or concentrated in few samples. We measured this concentration in public SEEG data. The source was OpenNeuro ds006519 version 1.0.0. We used 30 paired records from 17 patients. A finite 13–30 Hz filter retained four seconds in each marked period. We compared Gini energy concentration with 100 controls. The controls kept the input spectrum and used random phases. The mean patient change, after minus before, was -0.00398 Gini units. Its 95% bootstrap interval was [-0.01950, 0.00907]. The primary exact sign-flip test gave p = 0.638. This test requires independent patients and symmetric null signs. The test did not detect a mean change. This result does not establish zero change or a causal stimulation effect. An added check removed resampling edges and gave a mean change of -0.00474. The package has code, input epochs, source hashes, all scores, checks, and retrieval instructions. All 30 input records rebuilt exactly from public raw data.

beta energy · Gini coefficient · SEEG · intracranial EEG · phase randomization · surrogate data · negative motor response · epilepsy