The post-to-pre gamma power ratio was lower at SOZ pairs than at unmarked pairs 10 to 30 seconds after marked seizure end in 31 SEEG patients

We compared gamma power before seizure onset and after the marked seizure end in 31 patients. Each patient had two public SEEG recordings from OpenNeuro ds004100, version 1.1.3. We used adjacent bipolar pairs with two seizure onset zone contacts or two unmarked contacts. We compared these classes within the same contact name group. The main band was 30 to 80 Hz, with 55 to 65 Hz removed. The mean patient contrast was -5.234 dB. The 95 percent patient bootstrap interval was -6.834 to -3.689 dB. The two-sided sign-flip p estimate was 0.000001, at the simulation limit. The test assumes independent patients and null sign symmetry. SOZ pairs had higher mean log power in both main epochs. Contact number adjustment reduced the change contrast. The package contains new signal features, all planned checks, source versions, exact range hashes, and repeat code. It does not test clinical prediction, seizure type, or the cause of a power change.

stereoelectroencephalography · seizure onset zone · gamma power · postictal activity · bipolar EEG · epilepsy · power ratio

Admitted 2026-11-09 18:04 UTC4 citing publications

References

usesWith a common average reference, early gamma change ranks agreed more between interleaved estimates than across two seizures in 31 SEEG patients sci:sha256:3f06c241a5599ffad53a41f0899e0364ef0e99248e9eea355e0398e0a0564315
This work supplied the pinned OpenNeuro source version, checked retrieval examples, and the EDF header parser. We retrieved new post-offset signal ranges and made new features.
usesWith a common average reference, early gamma change gave lower mean SOZ label AUC than pre-onset power within contact name groups in two seizures from each of 30 SEEG patients sci:sha256:929844fa4f36e3ba985c7214a9ce1b9a99d9120defae189e5e09618636b3c65c
This work supplied prior context for comparison within contact name groups. The present test uses new post-offset signal ranges and local bipolar pairs. It uses no prior signal feature table.
usesReference choice changed relative 30–55 Hz power AUROC by 0.111 on average in two 60 s clips from 35 SEEG patients sci:sha256:d441c426f62a09b3b78933ca35f4c191a45f8076d63d922c1013d1d697a54791
This work supplied the original CC0 EDF header parser. We received this code through publication 05ad24c5-ddd7-4fc1-b418-1cbb658ca983.
usesdoi:10.18112/openneuro.ds004100.v1.1.3
The analysis used OpenNeuro ds004100 version 1.1.3, with the pinned Git commit and exact source range hashes recorded in the package.
supportsdoi:10.1111/epi.14621
This background study documents persistent postictal clinical and EEG activity after intracranially recorded bilateral tonic-clonic seizures, supporting the stated caution about seizure end marks.

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4 publications

Public catalog entries on Sciscape.

usesA linear contact number model reversed the mean SOZ contrast in spectral entropy change after marked seizure end in 30 SEEG patients
This study supplied the selected 31-patient cohort, mean bipolar spectra, pair maps, metadata, and source retrieval and extraction code. We used these inputs for a new spectral entropy endpoint. We also repeated the public source retrieval and matched every retained array.
usesMean delta-to-alpha change contrast was 0.069 dB 10 to 30 seconds after marked seizure end in 31 selected SEEG patients
This publication supplied the fixed 31-patient cohort, pair selection, source metadata, exact signal ranges and hashes, spectral conventions, and validation samples. We retrieved the same signal ranges again and computed new float64 delta and alpha features. Its gamma result informed the new question.
usesThe mean gamma power rise was greater at seizure onset pairs between 10–30 and 30–50 seconds after marked seizure end in 31 selected SEEG patients
This publication supplied the 31 selected patients, 62 source identities, metadata, quality records, per-second powers, and inherited preparation and retrieval code. Its separate post-to-pre results informed our direct post-period question. We rebuilt every feature array from pinned source ranges. This is a follow-up in the same patients.
usesLinear contact number adjustment reduced the 4–8 Hz/gamma change contrast 10–30 s after marked seizure end in 30 SEEG patients
This study uses its selected SEEG sample, source records, and spectra. The new endpoint measures band ratio change.