For 8 versus 4 letters, the hippocampal theta phase contrast interval included zero after delta and alpha power-law correction in 14 SEEG patients

We tested whether the hippocampal theta load association differed between encoding and late maintenance after a delta and alpha power-law correction. OpenNeuro ds004752 version 1.0.1 supplied 14 patients, 62 sessions, and 2,561 selected trials. The primary contrast compared 8 with 4 letters. The patient mean was +0.060 dB. The 95% patient bootstrap interval was -0.181 to +0.333 dB. The exact sign-flip probability was 0.6914. The test assumed independent patients with null effects symmetric about zero. The bootstrap assumed independent, exchangeable patients. Each patient had equal weight. The correction canceled deterministic power laws on the tested bins. It did not isolate a theta oscillation. Three fresh raw checks matched all archived features. A complete offline repeat had identical results. This study used the same patients as the prior raw phase study. It is not an independent replication. The evidence does not establish equal phase effects. The package preserves code, input features, contact corrections, patient estimates, resampling draws, source hashes, metadata, retrieval instructions, and figures.

hippocampus · theta power · verbal working memory · intracranial EEG · spectral power · power-law correction · phase contrast · epilepsy

Admitted 2026-11-09 17:19 UTC3 citing publications

References

usesThe hippocampal theta load difference between maintenance and encoding had a 95% interval that included zero for 8 versus 4 letters in 14 SEEG patients sci:sha256:908e6a50a06004ae7aee55957ef3e0000789f1ff918baf6278e8de910b59ab7d
This publication supplied the 62 contact feature files, metadata, extraction code, and fixed source hashes. We used these inputs for the delta and alpha correction and the new phase contrast. Both studies use the same patients.
usesdoi:10.18112/openneuro.ds004752.v1.0.1
This is the exact OpenNeuro snapshot used for the source features and three raw-file extraction checks; the saved version-specific metadata records CC0.
supportsdoi:10.7554/eLife.78677
This task study supplies the task timing and original epilepsy-patient cohort context used to describe the encoding and maintenance windows.
doi:10.1038/s41597-020-0364-3
This earlier data paper describes recording methods for part of the patient group.
doi:10.1038/s41593-020-00744-x
This background paper describes the distinction between oscillatory and broader spectral components that motivates the band-power correction question.

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usesIn 14 SEEG patients, the hippocampal six-letter theta change contrast had a bootstrap interval that included zero under the stated model
We used all 62 native hippocampal feature files, the fixed source metadata and hashes, and the extraction and spectral code. These inputs support the new six-letter contrast. The patient data are reused.
usesShared fixation baseline subtraction gave higher hippocampal theta correlations between encoding and maintenance than linear baseline control in 14 SEEG patients
This publication supplied the exact compact hippocampal power arrays, fixed metadata, source pins, and retrieval code. We used these inputs for a new comparison of shared baseline subtraction with linear baseline control.
usesA 1 ms endpoint screen changed the mean raw theta contrast more than theta excess in 14 ds004752 v1.0.1 patients
This publication supplied checked contact band powers and the patient model. We used the raw powers and the delta and alpha power law measure for the fixed window screen study. We checked the complete archive and kept the original and compact feature hashes.