Local baseline subtraction did not establish higher cued-key accuracy with eight SEEG pairs in later trials from eight people

We tested whether local baseline subtraction improves two-key decoding with eight bipolar SEEG pairs. The source was OpenNeuro ds004473 version 1.0.1. The fixed sample had 1,864 retained trials from eight people. Earlier trials trained each model. The 564 later trials tested it. Mean balanced accuracy was 54.75% with subtraction and 53.27% with absolute power. The paired mean change was 1.48 percentage points. The descriptive 95% person bootstrap interval was -3.18 to 7.25 points. The exact two-sided person sign-flip value was 0.6875, under independence and symmetry assumptions. Four people had higher accuracy with subtraction. These data did not establish a gain. Baseline-only accuracy was 54.47%. A proof shows gain cancellation when each pair has the same positive gain in both windows, above the numerical power floor. This property does not establish better decoding. The package preserves fixed features, all decisions, three figures, code, source versions and hashes, and fresh public raw ranges. All 10,008 audited power values matched after rounding. A full repeat gave 495 byte-identical files. This secondary analysis reuses test trials. It does not validate live BCI control.

stereoelectroencephalography · SEEG · baseline subtraction · log power · balanced accuracy · ridge regression · brain-computer interface · signal processing

Admitted 2026-11-09 16:48 UTC2 citing publications

References

supersedesLocal baseline subtraction did not establish higher cued-key accuracy with eight SEEG pairs in later trials from eight people sci:sha256:a3a13593d3792d5b7c1202afaa70738f8a43f2f550e620c2d7df37970a0bdcd6
This record corrects the package file inventory. The unchanged parent manifest is now included in the new package manifest. Scientific inputs, models, results, and figures are unchanged.
usesSEEG power before a response gives 57.7% mean balanced accuracy for two cued keys on later trials in eight recordings sci:sha256:9fcbc6aad0f73578b656a03c940b9381ab5791e8f9875ee291d7fc423328ee2d
This publication supplied the fixed power features, retained trial labels, split rule, source metadata, and raw retrieval hashes. The new study tests same-trial baseline subtraction with eight selected bipolar pairs. It also reproduces the source all-pair bipolar score.
usesdoi:10.18112/openneuro.ds004473.v1.0.1
This version-pinned OpenNeuro dataset supplied the SEEG recordings, task events, and channel metadata analyzed in this study.
doi:10.1088/1741-2552%2Facae0a

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usesAdded SEEG before a response gave no clear key prediction gain over earlier SEEG and task history with a linear reader in eight recordings
Prior baseline subtraction and concatenation tests informed the new question. We used separate group penalties and an omit-group option to test added prediction value. The study is a related test, not a direct replication.
usesA fixed SEEG power reader did not show clear ranking of the previous key before the next cue in eight people
We used its baseline subtraction question and scope to define a distinct test of a fixed response reader before the next cue. We did not use its feature arrays.