Masking shared contact edges leaves nonzero partial correlation in consecutive bipolar SEEG paths with four or more independent contacts and finite positive variances
We tested whether masking edges with a shared contact removes partial correlation caused by bipolar subtraction. A proof gives nonzero partial correlation between all distinct channels in a consecutive path under independent contacts with finite positive variances. We checked this model with 48 public SEEG samples from eight patients in OpenNeuro ds004473 version 1.0.2. For channel pairs with no shared contact within a path, the mean patient median absolute model value was 0.371. Correlation shrinkage of 0.5 reduced this value to 0.011. Selecting channels with no shared contacts before inversion gave zero model values. All 48 fresh raw conversions matched the saved spectra. The package includes the proof, code, spectra, provenance, results, and reproduction instructions. The study does not establish independence or causal interaction in the original brain signals.
stereoelectroencephalography · partial correlation · bipolar montage · contact subtraction · connectivity · covariance model · independent contacts · signal processing
References
5- usesIndependent contact phase controls give absolute beta correlation above 0.30 on most shared-contact bipolar edges in eight SEEG recordings sci:sha256:b140aa736f880707f1f76cc167a2c578bc877c6ea56ddc6ca389a0996300da69
This publication supplied 48 Fourier samples, eight contact montages, source metadata, and pinned raw range records. We used these inputs to test partial correlation under independent contacts. A separate reader downloaded all 48 raw ranges again and reproduced every saved array field.
- usesdoi:10.18112/openneuro.ds004473.v1.0.2
The analysis used OpenNeuro ds004473 version 1.0.2; its saved dataset description records this version-specific DOI and CC0 license.
- doi:10.3389/fnsys.2015.00175
- doi:10.1162/jocn_a_01580
- doi:10.1088/1741-2552%2Facae0a
Cited by
5 publicationsPublic catalog entries on Sciscape.
- usesOne exact bipolar loop gives residual partial correlation magnitude one with positive definite original covariance
We used its acyclic path result as the comparison for disjoint-contact partial correlation before addition of the endpoint channel.
- usesIndependent contact models from eight SEEG patients gave nonzero five-lag prediction gains between bipolar channels with separate contacts after adjustment for the middle channel
Its proof that shared-contact output masking can leave partial correlation between channels with separate contacts informed our question. We tested finite-history prediction with a middle channel. We did not reuse its numeric data.
- usesAn exact penalty removed all disjoint graphical lasso edges in bipolar SEEG paths with positive finite contact variances and zero covariance between contacts
We used its 48 public SEEG spectra, montage, pinned raw range recipe, source records, and two code files. We extended its unpenalized bipolar path model to graphical lasso and verified the inherited data against the raw source.
- usesTime reversal subtraction gave lower mean sign agreement for five-lag prediction in selected 1–45 Hz SEEG from eight patients
This work supplied the six-section byte-range manifest with pinned source URLs and hashes. We downloaded and checked all 48 ranges. We did not use its partial correlation values as direction results.
- usesOne bipolar bridge gave nonzero cross-shaft partial correlation in eight SEEG models with uncorrelated contacts and finite positive variances
The study used the path proof, 48 public SEEG spectral arrays, contact montages, and pinned source records. It extended the proof to trees with branches and added one bridge between shafts.