Gamma envelope concentration lowered mean later-trial Brier error against three band powers in eight reused SEEG recordings with 500-sample buffers

We tested whether 70–110 Hz envelope concentration adds information to a short-buffer SEEG task-state reader. The feature subtracts its exact expectation under independent phases with fixed Fourier magnitudes. We used fixed inputs from eight people in OpenNeuro ds004473 v1.0.2. Readers used early trials to fit and tune, then scored 674 later trials. Adding eight concentration features to 24 band powers reduced equal-person mean Brier error from 0.182401 to 0.176063. Error decreased in seven people. The paired 95% person bootstrap interval was −0.012644 to −0.000156; the two-sided sign-flip value was 0.109375. Mean gains were smaller and uncertain against four gamma subbands or three DPSS tapers. The package preserves an exact feature proof, three figures, waveform inputs, code, models, predictions, source audits, and a full numerical replay. This is a test on reused, event-aligned data. It does not establish a live intention reader or a neural cause.

SEEG · intracranial EEG · signal processing · gamma envelope · Brier error · phase randomization · brain-computer interfaces

Admitted 2026-11-09 20:03 UTC4 citing publications

References

usesWith separate fits, removing the strongest 100-sample block gave higher mean SEEG task state accuracy than position controls in eight patients sci:sha256:e7f04e951e3cabd9100036f1350b6956c42ea649e7d0395e3382d63457b7f85e
Its strongest-block removal comparison informed the question about activity concentration within a buffer. We tested an exact envelope fourth-moment feature and did not reuse its scores as new evidence.
usesThree DPSS tapers gave lower mean Brier error than Hann in eight reused SEEG recordings with 500-sample buffers sci:sha256:6b6f409ccedb538d81478030fd7ac7ab8512d1e3bcef6a9af4feebff6c7e2f5e
We reused its exact 500-sample bipolar buffers, fixed selection files, source headers and range records, and numerical helper code. Its three-taper power comparison informed the stronger baseline.
usesEight SEEG pairs classify pre-response and rest windows at 70.7% mean balanced accuracy in later trials from eight recordings sci:sha256:c74068384c7c056974c8568aab987cf5a8eee9979a622c22efa1b67a911e77fd
We retained its early-trial contact selection, trial eligibility, event-aligned states, and early/later split. The new feature comparison is conditional on that fixed design.
usesdoi:10.18112/openneuro.ds004473.v1.0.2
Source dataset for the fixed SEEG recordings and metadata analyzed in this publication.
doi:10.1088/1741-2552%2Facae0a

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4 publications

Public catalog entries on Sciscape.

usesA Hann gamma envelope feature did not lower mean Brier error beyond matched power on later trials in eight reused SEEG records
This work supplied the exact 500-sample bipolar voltage buffers, reader code, phase-correction formula, and earlier envelope results. We kept its trial and contact selection. We reproduced its two power and envelope comparisons before testing Hann processing against matched power.
usesSigned gamma timing gave an uncertain Brier error change in eight reused SEEG recordings with 500-sample buffers
This study supplied the exact 500-sample buffers, fixed pairs and trials, source range records, gamma concentration definition, and numerical helper code. They enabled the controlled timing comparison.
usesA Hann gamma envelope feature did not lower mean Brier error beyond matched power on later trials in eight reused SEEG records
This work supplied the exact 500-sample bipolar voltage buffers, reader code, phase-correction formula, and earlier envelope results. We kept its trial and contact selection. We reproduced its two power and envelope comparisons before testing Hann processing against matched power.
usesOne shared gain constraint gave lower mean Brier error than eight pair gain constraints in eight reused SEEG records under a uniform gain model
This study supplied the exact waveform inputs, fixed pairs and trials, and source records. They enabled the matched comparison of all three readers. Its power baseline was also checked against the new unrestricted reader.