Shifts after bipolar subtraction reject 99.55 percent of shared contact beta tests at a five percent threshold with independent contact shifts from eight SEEG records
We tested two controls for beta SEEG correlation. SEEG means stereoelectroencephalography. The model used independent circular shifts of stored contact signals from all eight people in OpenNeuro ds004473 version 1.0.2. It kept each contact waveform and its spectrum. At p <= 0.05, a control that shifted bipolar channels after subtraction rejected 99.55 percent of tests with a common contact. A control that shifted contacts before subtraction rejected 4.95 percent. For separate contacts, the rates were 4.88 and 4.90 percent. Each person had equal weight. The mean shared contact difference was 94.60 percentage points. Its descriptive person bootstrap 95 percent interval was 93.61 to 95.22. The package contains 563 four-contact runs, exact source ranges, spectra, shift draws, p values, four figures, code, and a covariance proof. A full repeat matched all saved numerical arrays. The two controls test different null models. The channel control tests separate output shifts. It cannot establish contact interaction when the channels use a common contact. These results test a method. They do not show a neural connection or a gain in a working brain-computer interface.
stereoelectroencephalography · SEEG · bipolar montage · circular shifts · surrogate testing · beta band · correlation · signal processing · calibration · brain-computer interface
References
4- 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 used its fixed EDF headers, metadata, source object version URLs, and MIT retrieval and header helpers. We read new byte ranges and added a contact-null calibration analysis. We did not use its decoder features or results.
- usesBipolar SEEG pairs with a shared contact have higher mean absolute beta correlation than the nearest pairs with separate contacts in 21 patients sci:sha256:f9206e6467700c572ec5f73a7622ca0b4d27200ce928e5b1393ab3a0c47567c8
Its result on shared contact beta correlation motivated the question. We used a different dataset with stored contact signals and tested the order of surrogate shifts and bipolar subtraction. We did not use its signal arrays or code.
- usesdoi:10.18112/openneuro.ds004473.v1.0.2
The publication analyzed fixed signal ranges from all eight available SEEG contact recordings in this exact dataset version.
- doi:10.1088/1741-2552%2Facae0a
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesOutput shift controls rejected 66.89 percent of shared contact tests under a simulated 2 ms delay in eight SEEG records
We reused all eight beta contact spectrum files, the contact run selection, source metadata, range provenance, and MIT retrieval code. Fresh public downloads reproduced all input arrays. We added a band pooled imaginary coherency calibration test with known simulated output delays. We did not reuse the parent correlation scores as our new result.
- usesLinks with a shared contact had a larger share of strong local gamma correlations over 60 seconds in 33 SEEG patients
We used this study to state the independent-contact control and its limits. We computed exact covariance from measured contact variances. We did not repeat its contact-shift test or use a surrogate p value.
- usesSEEG rings recovered simulated constant integer output delays from -2 to +2 samples in eight records. Mean recovery was 99.46% with 1-second calibration, 5% independent Gaussian noise, and equal gains
Used the upstream good-contact and four-contact cohort selection carried through the cited parent work. No ring was selected by the new delay-recovery results.
- Output phase controls rejected 90.95 percent of shared contact beta tests under independent contact phases from the first two seconds of SEEG in 33 patients
[Legacy relation: reproduces] Replicated the control-order calibration question with independent Fourier phases rather than circular shifts, in short beta and high gamma windows from a separate 33-patient public SEEG cohort.