Adjacent contact differences could not determine 44 percent of common-average beta power on average in 19 selected SEEG records
We tested whether consecutive contact differences leave a larger undetermined power fraction in beta than in high gamma. We used 120 seconds from each of 19 public SEEG patients. The mean difference was 1.75 percentage points. The exact two-sided sign flip test gave p = 0.594. The descriptive patient bootstrap interval was -4.74 to 7.55 points. The comparison did not establish greater beta loss. The mean undetermined common-average power fractions were 44.16 percent in beta and 42.41 percent in high gamma. A graph projector and SVD checks defined the voltage modes that the montage could not identify. The package includes code, compact spectral data, source pins, tests, and repeat instructions. The patients had epilepsy and came from an inherited selected cohort. Contact names defined adjacency. The fractions do not identify neural power, artifact power, or clinical benefit. Shared-reference invariance requires the same reference at all contacts. Exact sign flips assume independent patients and symmetric null contrasts.
stereo-EEG · SEEG · bipolar montage · common-average reference · signal identifiability · power spectrum · beta band · high gamma · epilepsy
References
5- usesThe common-reference-invariant beta component contributed more to agreement in 19 adjacent-minute SEEG records sci:sha256:f0d64ceacebda1587fbb8cf20d8bc531c139cbd98608e6166f45e2a4738cfa1d
Its analysis and source quality rules helped distinguish common-reference cancellation from the montage nullspace. The present power fractions use the same cohort. They differ from its cross-spectrum endpoint.
- usesSample rank forced 92.8 percent of unrestricted complex canonical beta coherence scores to one in selected 20-second SEEG samples from 19 patients sci:sha256:32fd9b2dcef61781cc6d5987c2db0808052487e232705a6208abd3c87ce55a3c
Its archive supplied selected records, pinned EDF byte ranges, source headers and metadata, and the EDF helper. We adapted its retrieval and metadata selection code. These files enabled a new montage power audit on the same 19 patients.
- usesdoi:10.18112/openneuro.ds003876.v1.0.2
The selected SEEG records were from OpenNeuro ds003876 version 1.0.2; the source metadata identify this exact version and CC0 license.
- doi:10.1016/j.neuroimage.2018.08.020
- doi:10.1088/1741-2552%2Fae1b3b
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesEarly calibration reduced later error for removed beta voltage by 64 percent on average in 19 selected SEEG records
We used its contact exclusions and the voltage modes removed by adjacent differences. We tested statistical prediction of those modes from earlier calibration. The result does not change its nonidentifiability proof.
- usesFour-step bipolar pairs had higher mean 30–80 Hz exponents than one-step pairs in 19 selected SEEG records when 58–62 Hz was omitted
We adapted the source checks and contact-name rules from this montage audit. We used complete five-contact paths for the new span comparison. We did not use its montage outcome tables as evidence for the new result.
- usesLocal differences and group contrasts preserved common-average voltage in 19 SEEG records
This publication supplied the fixed 19-record selection, contact rules, graphs, source pins, metadata, examples and reader code. We downloaded the selected ranges again and computed new preservation results.