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q-bio.NC · Neurons and Cognitioneess.SP · Signal Processing

Two covariance targets kept SEEG site decisions fixed across full layouts of consistent contact differences but differed on 115 of 536 pulses in four records

We tested site readers with public SEEG stimulation data from OpenNeuro ds004457 version 1.0.2. The primary test used 134 known sites and 536 early test pulses in four records. A fifth record was a two-contact control. Each site used four fit pulses and four later test pulses. The split was ordered within each site. The new covariance target retains a separate variance for each contact component and time bin. It was compared with an earlier constant contact target. Both targets kept all decisions fixed across adjacent, star, and redundant complete layouts of the same consistent contact differences. However, the two targets differed on 115 of 536 early decisions. Their equal record mean accuracies were 44.21% and 44.25%. Layout invariance does not select a unique reader. The fixed diagonal target changed 117 decisions for the star layout and 52 for the complete layout. We reproduced all 1,464 archived early decisions from the earlier reader. Independent scores and full runs from fresh raw data passed. The package preserves four figures, code, voltage bins, fitted readers, source hashes, and repeat instructions. The study is offline. It does not establish an accuracy gain or a live BCI benefit.

stereoelectroencephalography · SEEG · covariance regularization · contact geometry · site classification · brain-computer interface · electrical stimulation · layout invariance

Admitted 1 citing publication

References

8
  1. usesA contact metric ridge kept gamma scores between shafts unchanged across two full bipolar layouts on the same contacts in 32 SEEG patients sci:sha256:7faf68802628950e12aa1e89707154f65b0c83cf550902e08295ae655105d9e0

    Its contact metric ridge result informed the initial question.

  2. A contact covariance rule kept SEEG site decisions equal across equivalent bipolar trees in five offline patient tests sci:sha256:266e261520b7a5373485335ce240348d8e68e0cd91f18b9f5c7da05f29889c76

    [Legacy relation: reproduces] We reproduced all 1,464 early site decisions at shrinkage 0.5 for adjacent and low star layouts. We compared its constant target with a component and time dependent target.

  3. usesA contact energy scale preserved SEEG forecasts across two full bipolar layouts on the same three contacts in eight patients sci:sha256:41d53e192fa3eaa6c46147a168ada8de89affd4528d2b83b1f6dbf3844a07b93

    Its contact energy forecast result informed the initial question.

  4. usesA contact covariance rule kept beta distances equal across redundant pair layouts in 35 SEEG records with consistent contact differences sci:sha256:12610080f0a52b085aa0f0a96d3ef097c0ad3cbc25a687f0e866822752c16b04

    We used its consistent contact difference assumption and redundant layout covariance proof to check site reader scores.

  5. usesA SEEG reader kept an after-pulse site accuracy gain after removal of linear trend use in five offline patient sessions sci:sha256:bb2ab1feb65907a20b72918e38ceb558f7e95be8c82f8d97c390865040db3bf4

    We reused its voltage bins, contact rules, pulse split, and raw retrieval code. We checked the source hashes and rebuilt the bins.

  6. usesdoi:10.18112/openneuro.ds004457.v1.0.2

    The analysis used OpenNeuro ds004457 version 1.0.2.

  7. doi:10.1523/JNEUROSCI.1325-22.2023
  8. doi:10.1109/TPAMI.1982.4767298

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