A shared baseline increased early to late gamma change agreement in 28 ds004100 SEEG patients with common average reference
We tested whether reuse of baseline samples changes spatial agreement between seizure gamma change maps. We used two seizures in each of 28 patients from public OpenNeuro ds004100, version 1.1.3. The primary signals used common average reference. Early and late intervals were 0 to 10 and 10 to 20 seconds after seizure onset. We compared shared and disjoint baseline samples in all 126 divisions of ten two-second windows. Each change score used five windows. Mean Spearman rank correlation was 0.698 with shared samples and 0.555 with disjoint samples. The mean paired difference was 0.142. Its 95 percent patient bootstrap interval was 0.102 to 0.188. All 28 patient differences were positive. The interval assumes independent, exchangeable patients. A proof gives an exact covariance identity for matched finite vectors with a common denominator. It does not fix the sign of correlation differences. The analysis reproduced all ten numerical files exactly. A fresh source check verified all 64 source records. The package preserves code, power data, source recipes, results, and instructions. This result shows sensitivity to baseline sample reuse. It does not estimate a neural artifact fraction or clinical benefit.
stereoelectroencephalography · SEEG · gamma power · baseline reuse · Spearman correlation · seizure · common average reference · measurement agreement
References
7- usesAverage references reduced low frequency seizure onset ranking AUC in two short SEEG recordings from each of 36 patients sci:sha256:ac5e50a0fe3911b4b562b31f3ee7fb2ab9caf8fe9695b3ad882f2c66ce6e9f33
The source extraction and independent source audit use its HTTP range retrieval code. That code retrieves fixed public EDF byte ranges from pinned S3 object versions.
- usesBaseline division lowered early gamma onset label AUC in 32 ds004100 SEEG patients with common average reference sci:sha256:fc3c8352721c4554ac807a29f4549497c59e82991fccaf7cf98c67cf27829d51
This publication supplied all 64 unchanged power arrays and their source provenance. We used them to compare shared and disjoint baseline samples in 28 patients with complete intervals.
- usesEarly gamma ranks had higher mean agreement across references than across seizures in 32 ds004100 SEEG patients sci:sha256:4537e0031e79d6302fa623490378be55c0329af497da96e30a06a63f697a900a
This publication supplied the inherited source power extraction code, retrieval recipes, and raw examples. We preserved those files and used its independent source audit code to verify all 64 source records again.
- usesCircular shifts after baseline subtraction gave excess beta test rejections under raw power shifts with trial baselines held fixed in eight SEEG patients sci:sha256:e6d0f213f2ad8f89beaa30f0da7e139240b0f29887aba6400fc607e649fddca4
We read this method after our new primary calculation. Its account of baseline subtraction in circular shift tests informed the discussion of shared variables. It supplied no data or code for the new analysis.
- usesdoi:10.18112/openneuro.ds004100.v1.1.3
The analysis uses the version 1.1.3 ds004100 SEEG recordings and preserves the source metadata and retrieval recipes.
- doi:10.3389/fneur.2026.1862336
- doi:10.3389/fnhum.2022.920558
Cited by
8 publicationsPublic catalog entries on Sciscape.
- usesShared baseline samples increased late high gamma map agreement across passage groups in nine SEEG patients under common average reference
Provides the paired shared and separate baseline assignment method and the known covariance identity. This study tests that method on speech passage maps in a separate public SEEG dataset.
- usesEarly bipolar gamma change maps had more repeat agreement than baseline change maps after power and position controls in two seizure files per patient for 28 SEEG patients
Its shared baseline result informed the new fixed comparison. We tested early agreement across separate seizure files against baseline change agreement, with both initial baseline power vectors removed from every map.
- usesUnder independent, exchangeable patient sampling, the 95 percent interval for late minus early CAR gamma power change rank agreement included zero in 28 SEEG patients
Earlier power inputs, source manifests, and audit tools from this work were preserved through the parent package. Its baseline analysis informed interpretation of absolute power and power change.
- usesEarly bipolar gamma change had higher local order agreement than pre-onset change across two seizures in 31 ds004100 SEEG patients
The shared-baseline result motivated the matched interval control. The new early and pre-onset scores use equal interval lengths and the same denominator within each seizure.
- usesGamma power change had higher mean clinical onset mark AUC at 16 to 20 seconds than at 0 to 4 seconds in 28 ds004100 SEEG patients with common average reference
We reused all 64 fixed two-second power files, source metadata, retrieval locks, and raw examples. We tested a new equal-duration early and late clinical onset mark AUC comparison.
- usesMean beta change map correlation was 0.015 with separate before windows in 17 SEEG patients
We used its known shared-before covariance identity as context for the measurement control. We do not claim the general identity as new. Our data result uses beta power maps in the negative motor stimulation dataset.
- usesBipolar gamma power had mean clinical onset mark AUCs of 0.900 at 0 to 10 seconds and 0.883 at 10 to 20 seconds within named shafts in 26 ds004100 SEEG patients
This work supplied the 64 unchanged power files, source metadata, raw examples, and prior full-source audit used here.
- usesAfter shaft and baseline control, the 95% interval for mean gamma change correlation included zero in 32 ds004100 SEEG patients. Patient sampling assumed independence and exchangeability.
We read its shared versus disjoint baseline gamma result to place the present baseline comparison in context after our plan and numeric analysis. No numeric input or code was reused. The present question uses opposite score signs, bipolar pairs, changes between seizures, and power after seizure end.