Full contact ranks controlled beta PSI test size under independent uniform segment rotations in two SEEG records

We made an exact phase slope index (PSI) benchmark from public SEEG data in OpenNeuro ds005670 version 1.0.0. The fixed selection has 28 shared-contact bipolar pairs from two patients. Under independent uniform contact segment rotations, a common rotation leaves PSI unchanged. Thus N squared relative contact shifts give the same null score distribution as N cubed full shifts. Inclusive full contact ranks have test size at most the nominal threshold under this conditional null. We checked every relative contact configuration and every output shift. At a 5 percent threshold, the equal patient mean rejection rate was 18.1080 percent for output shifts and 5.0000 percent for full contact ranks with 200 two-second segments in 13 to 30 Hz. The first 100 segments gave 8.5135 and 5.0000 percent. The 5 percent contact rate follows from the rank construction. All 28 input arrays rebuilt from fresh, complete, version-locked raw EDF files exactly. Direct rotations, a separate numerical backend, full-versus-reduced shift checks, disjoint controls, and batch-size repeats passed. The package preserves the proof, a reusable exact test, code, inputs, all score and rank grids, source provenance, results, and reproduction instructions. This is a secondary method analysis of the same records used by the cited parent study. It adds a deterministic benchmark. It does not show neural coupling, test sensitivity, clinical validity, or population transfer.

phase slope index · SEEG · exact test · segment rotations · shared contacts · beta band