A one-second shift of a three-second window changed 4.56% of offline 4 to 8 Hz Fourier phase labels by more than 45 degrees in 21 SEEG patients
We tested whether an offline 4–8 Hz Fourier phase label stays fixed when a three-second SEEG window moves by one second. We analyzed all 35 released records from 21 people in OpenNeuro ds006519 v1.0.0, scoring the same central second with equal person weights. Phase labels differed by more than 45° at 4.56% of scored times (95% person bootstrap interval 3.89%–5.29%); 1.46% differed by more than 90°, and every person showed changes above both limits. Disagreement was lower in higher-amplitude groups. A fixed local kernel gave equal labels from shared samples within numerical precision. These results measure differences between specified offline labels, not error against true brain phase. The study uses one band, short segments, one clinical cohort, and one hard-band Fourier target family; it does not establish a stimulation effect or transfer to other interfaces.
SEEG · Fourier phase · window context · phase stability · signal processing · intracranial EEG · offline estimation
References
3- supportsReversed future samples changed earlier zero-phase 70 to 110 Hz SEEG power in 35 records from 21 patients sci:sha256:1a522b5f1ec86965aca92806558028dda84eca61f8178c2f496daf14d4f7d6a9
This result adds a phase-label example to its finding that offline SEEG features can depend on samples outside their assigned time. The current test shifts the context of unchanged records. The cited test replaced future samples and measured high-frequency power. Both studies use the same 21 people. This is not an independent patient sample, and we did not repeat its power test.
- usesOffline 4–8 Hz Fourier phase moved backward in SEEG baselines from all 21 tested patients sci:sha256:dae7c93d05df28b4f4e64227f414662fc5cde87958c077350de4b454e29c4919
We used its retrieval manifest, pinned source metadata, BrainVision reader, retrieval code, and channel selection logic. We downloaded the raw files and made new shifted-window coefficients. The rebuilt four-second coefficients and channel selections matched its archived inputs. Its phase-rate scores were not analysis inputs.
- usesdoi:10.18112/openneuro.ds006519.v1.0.0
The analysis used all released records from OpenNeuro ds006519 version 1.0.0; its recorded version-specific DOI and CC0 license identify the source dataset.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesA one-second window shift left 4.66 percent of offline Fourier theta crossings unmatched within 25 ms in 21 SEEG patients
We use the archived Fourier context inputs, source metadata, and retrieval code. We rebuild every input from public voltage and compute new crossing events and one-to-one timing matches. The cohort is shared.
- usesThree references gave 4.58 percentage points less joint 45-degree agreement than one for nominal 50 ms forecasts with a fixed gate in 36 SEEG patients
Uses the prior shifted-window phase result as scientific context for reference dependence. The new study tests three same-nominal-band FIR spans in a different 36-patient cohort. It reuses no code or samples from that context study.
- usesA one-second window shift left 4.66 percent of offline Fourier theta crossings unmatched within 25 ms in 21 SEEG patients
We use the archived Fourier context inputs, source metadata, and retrieval code. We rebuild every input from public voltage and compute new crossing events and one-to-one timing matches. The cohort is shared.