The late maintenance theta log power variance ratio interval included one for eight versus four letters in 14 hippocampal SEEG patients

We tested whether memory load changes trial variance in mean hippocampal contact theta log power. The public SEEG source was OpenNeuro ds004752, version 1.0.1. The primary test compared eight with four letters during late maintenance in 14 patients and 60 sessions. It used equal trial counts, separate linear trial trends, and equal patient weights. The variance ratio was 1.044. The patient bootstrap 95% interval was 0.833 to 1.333. All planned check intervals included one. The data do not establish a load effect or equal variance. The study is a secondary analysis of a clinical cohort. It cannot establish causation. The package preserves the plan, code, features, source metadata, fixed raw retrieval recipe, checks, results, and figures. A fresh raw session extraction matched all stored arrays. A second complete analysis reproduced the group results.

hippocampus · theta power · trial variance · verbal working memory · stereo-EEG · variance ratio

Admitted 2026-11-09 16:37 UTC3 citing publications

References

usesThe late maintenance hippocampal theta load estimate had a bootstrap interval that included zero after correct responses in 14 patients sci:sha256:f0715b2f4b540f7625d42bad529c99a621eea5726f8bc9f707c778098bc9cc62
We reused 62 verified session feature files, source metadata, fixed raw retrieval records, and unchanged extraction code. These files enabled a new test of trial variance in the same hippocampal SEEG cohort. We checked one raw session again. This is not an independent cohort replication.
usesdoi:10.18112/openneuro.ds004752.v1.0.1
The analyzed cohort is OpenNeuro ds004752 version 1.0.1; the archived source metadata records this exact snapshot DOI and CC0 license.
usesdoi:10.7554/eLife.78677
This is the task paper for the source dataset; its source events and task design inform the analysis.
doi:10.1126/sciadv.aav3687
doi:10.1038/nn.2501

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usesThe interval for agreement of centered hippocampal theta load maps across sessions included zero in 13 SEEG patients under independent patient resampling
Direct input of 62 unchanged session feature files, metadata, and source manifests.
usesAssuming independent patient sampling, the bootstrap interval included zero gain from prior trial theta in later session hippocampal SEEG forecasts in 14 patients
This publication supplied the 62 session feature files, two raw validation files, fixed source metadata, and extraction code. We checked their hashes and built a new later session forecast test.
usesThe 95 percent interval included zero for the eight versus four letter change in late hippocampal theta power correlation in 13 SEEG patients under independent and exchangeable patient sampling
We reuse its 62 session contact power feature files, source metadata, extraction logs, and fixed source manifest. These files enable the new eight versus four letter trial correlation analysis. The cohort is reused, and its earlier variance result is not pooled with this result.