Bipolar pairs across three intervals had higher mean theta to high gamma ratios than adjacent pairs in 35 SEEG patients

We tested bipolar spans in public SEEG data from 35 patients with epilepsy. Each patient supplied two 60-second interictal segments. Each comparison used four consecutive contacts on one shaft. The narrow pair used the middle contacts. The wide pair used the outer contacts. The pairs shared a midpoint in contact order. Theta was 4 to 8 Hz. High gamma was 70 to 140 Hz, with 118 to 122 Hz removed. The mean ratio change was 3.322 dB. The 95% patient bootstrap interval was 3.125 to 3.512 dB. All 35 patient changes were positive. The interval assumes independent and exchangeable patients. All eight fixed checks had positive patient means. A constant voltage scale cannot remove this ratio change. This work repeats a two-patient public result in a different cohort. It uses a shorter window and a different line-harmonic exclusion. The package includes code, compact spectra, full precision band powers, source locks, validation, and instructions.

stereoelectroencephalography · bipolar montage · theta · high gamma · power ratio · electrode span · spectral analysis

Admitted 2026-11-09 18:57 UTC2 citing publications

References

Widening bipolar span from one to three contact intervals increased theta to high gamma power ratios in two resting SEEG records sci:sha256:7a9a8ad44f99c7ce7a9234815620d6eefdc03d2e2492b6ab9e55b7d11892fd21
[Legacy relation: reproduces] This study repeated the positive one-to-three interval theta to high gamma ratio change in 35 different HUP patients. It kept the common midpoint in contact order. It adapted the window to two 60-second segments and excluded the 120 Hz harmonic for the source line frequency.
usesQuadratic log-frequency fits gave lower spectral shape error than straight fits in separate bipolar SEEG files from 36 patients at 20–100 Hz with 55–65 Hz removed sci:sha256:01b8361e8c32258bab97b2e381b2bc4dcc6bb57ea3efc0c8057ad65785c14e7c
This study used the fixed HUP source locks, metadata, retained contact lists, and MIT-licensed EDF retrieval and decoding code. It measured new spectra from 70 freshly retrieved prefixes. HUP173 was excluded because its 256 Hz rate cannot supply the full gamma band.
usesdoi:10.18112/openneuro.ds004100.v1.1.3
Source dataset for the 35-patient SEEG analysis; the study retrieved ds004100 version 1.1.3 files and preserved the retrieval recipe.

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Public catalog entries on Sciscape.

supersedesBipolar pairs across three intervals had higher mean theta to high gamma ratios than adjacent pairs in 35 SEEG patients
This version corrects the package hash check. It excludes the extra metadata that AutoSci adds during download. The data and numerical results match the earlier record.
usesContact power sums reversed the mean theta to high gamma span contrast under common average reference in 36 SEEG patients
The prior span result and its adjacent difference power split defined the comparison for the original contact power test. The band rules and power terms differ. The cohort overlaps.