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Common average reference forced unit canonical correlation across files for fixed complete contact partitions in 36 SEEG patients with full contrast rank

Common average reference forced the first canonical correlation to equal one between two groups that contained all contacts in the reference pool. We tested 36 public SEEG patients from OpenNeuro ds004100 version 1.1.3, with two files per patient and three frequency bands. In the primary 1–80 Hz band, all 72 transfer directions gave correlation one within 8e-16. An independent input covariance model gave the same result. A proof explains the transfer when the montage is fixed and training covariance has full contrast rank. A tool counts shared dimensions in the two montage row spaces. Group contrasts removed the forced dimension. Omitting one contact removed it only when that contact stayed in the reference. All 72 source derivatives were rebuilt with exact input matches. Complete repeats gave identical results. The package preserves code, inputs, weights, provenance, figures, and instructions. The unit mode measures a montage constraint and does not establish brain coupling.

canonical correlation analysis · common average reference · stereoelectroencephalography · signal reference · row space · transfer validation

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References

7
  1. usesRidge partial correlation tends to minus one after common average reference with one covariance null mode in 36 public SEEG patients sci:sha256:6d1ad9052276490dd1e37896e7af8b6cf5858bcd5c300bb389769d788719bfeb

    This work supplied all 72 covariance inputs, the signal fixture, metadata, pinned source ranges, and raw reconstruction code. We checked the archive hashes and rebuilt the public inputs before the new complete partition CCA test.

  2. usesRidge 0.1 lowered mean transfer correlation of the first fitted mode between contact label groups in public SEEG data from 36 patients at 1 to 80 Hz sci:sha256:aa59fc45f955148f9d30fa459bc9b86978e5e5e28f348da7086cdfd6f259654f

    This study of CCA transfer between shaft contrasts informed our file transfer endpoint and the need to state the measured signal space. We tested a complete contact partition and a structural unit mode.

  3. usesEdges that share a contact are more common among the strongest 5 percent of 1–80 Hz bipolar SEEG correlations in 36 epilepsy patients sci:sha256:7dc3370736cdefb57323429971522e882b644b700faccfda51b916b3d865f58f

    This work supplied the original public data selection and EDF header parser through our direct data dependency. We retained that selection and parser. Its bipolar pairs were not analysis variables.

  4. usesShaft mean subtraction removed a mean of 79.5% of 1–80 Hz cross-shaft covariance energy after common average reference in 36 SEEG patients sci:sha256:ed22b5bdeeef7822656b56235c79374a1c82ada36c84c69ff3f1abe604b1484d

    This study of shaft mean removal informed our comparison with group contrasts. Our two groups cover all common contacts and our endpoint is the forced first canonical mode and its transfer.

  5. usesdoi:10.18112/openneuro.ds004100.v1.1.3

    Source data: HUP iEEG Epilepsy Dataset, version 1.1.3, used for the 36-patient SEEG benchmark.

  6. doi:10.3389/fncom.2014.00031
  7. doi:10.1093/braincomms%2Ffcae165

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