A contact metric preserved 500 ms ridge lag dependence across equivalent contrast bases in 18 SEEG records from nine adults
A contact metric preserved a ridge lag score across equivalent SEEG contrast bases. The test used 18 public records from nine selected adults in OpenNeuro ds003688 version 1.0.7. Each record supplied two 50 s blocks. The primary lag was 500 ms and the ridge strength was 0.1. Adjacent bipolar and orthonormal bases retained the same contrast space. The score was the mean squared regularized canonical correlation. Identity ridge changed the score by a mean absolute 0.00605 across adults. The descriptive adult bootstrap 95 percent interval was 0.00258 to 0.00968. The mean coordinate change minus block change was -0.00127. Its interval was -0.00559 to 0.00291, and the exact two-sided sign-flip p value was 0.582. This comparison did not establish that coordinate change was larger than block change. The metric correction preserved scores and spectra to numerical precision. The proof requires an invertible coordinate change, the same retained space, the same samples, and the same ridge strength. Direct bipolar calculations, analytic examples, four pinned native rebuilds, and a complete repeat passed. The package contains the 18 arrays, source code, proof, metadata, all fixed results, and offline and native reproduction instructions. The result concerns the specified estimator. It does not establish a neural cause, a clinical benefit, or an optimal ridge strength.
stereoelectroencephalography · ridge regularization · canonical correlation · coordinate invariance · lag dependence · signal processing
References
5- usesWith scale matching and a 1% ridge, fixed 50% covariance pooling lowered 1–80 Hz SEEG prediction loss in 29 of 36 epilepsy patients sci:sha256:4e89c74307bf8f48b5bd0cda9e74c9554126ad2e463998a15777a88cab1ff3cf
Its coordinate metric for ridge covariance prediction informed the metric correction for regularized lag canonical correlation. None of its data arrays or numerical results enter this analysis.
- usesFixed linear models gave lower mean normalized 500 ms SEEG prediction error within records than between paired rest and film records in nine adults sci:sha256:158bc9a242c61384bf400795feb8251c594f7805a112626ccbcc847fe76ae4b4
This publication supplied the 18 unchanged compact SEEG arrays, fixed nine-adult selection, source metadata, pinned native provenance, and two retrieval programs. Its earlier temporal prediction result was read. Its models and prediction scores do not enter the new lag scores.
- usesReference changes gave larger average SEEG autocorrelation half-width differences than rest block changes in nine selected adults at 0.5 to 40 Hz sci:sha256:02026926893f88e5d4af3e37d2f140f7fa2942f3b8fbf177b35a5732a9c94f0b
Its reference and time width comparison motivated this coordinate audit. The new comparison retains the same contrast space to isolate the ridge coordinate effect. Its width values and data arrays do not enter the new scores.
- usesdoi:10.18112/openneuro.ds003688.v1.0.7
The analysis uses the 18 compact SEEG arrays and source metadata for OpenNeuro ds003688 version 1.0.7.
- supportsdoi:10.1038/s41597-022-01173-0
The cited dataset paper describes the clinical recordings and the rest and film tasks used as source context.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesMean simultaneous 0.5 to 20 Hz SEEG excursion rates exceeded controls with fixed cross spectra in nine selected adults
This publication supplied the 18 compact arrays, fixed cohort, metadata, native provenance, and source retrieval code. This study used those files for a new simultaneous excursion test with common phase controls. All 116 imported file hashes matched.
- 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
This work used the contact metric principle from this prior method. It applied the transformed metric to canonical modes between contact label groups and tested transfer to a separate file in a different cohort.
- usesA contact metric preserved 10 ms signed lag prediction gain across three equivalent shaft contrast bases in 19 SEEG records at 1 to 40 Hz
This publication supplied the contact penalty geometry and invariant trace scale for a congruent covariance ridge. The present method applies that principle to signed covariance prediction between named shafts. No source code or patient arrays from the metric publication were copied.
- usesMean simultaneous 0.5 to 20 Hz SEEG excursion rates exceeded controls with fixed cross spectra in nine selected adults
This publication supplied the 18 compact arrays, fixed cohort, metadata, native provenance, and source retrieval code. This study used those files for a new simultaneous excursion test with common phase controls. All 116 imported file hashes matched.