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q-bio.NC · Neurons and Cognition

A SEEG library from four earlier pulses per known site identified three of six first return pulses at 20–100 ms in three sessions

We tested whether earlier SEEG pulse responses could identify a known stimulation site when it returned after other sites. We used OpenNeuro ds004457 version 1.0.2. The fixed input pool had 1,904 eligible pulses at 183 sites in five patient sessions. Each site entered a growing library after four responses ended. The reader used voltage at 20–100 ms and a fixed covariance rule. It identified three of six first return pulses from three sessions. A diagonal rule identified two. The latest completed eligible-site label identified one. That label control identified 1,130 of 1,135 scored pulses overall. Thus, continuation pulses gave little evidence about response identity at a site return. The return sample is too small to establish a reliable brain interface. Eligibility used retrospective source quality and pulse counts. The test assumed known pulse times and earlier site labels. The package includes a response-library tool, all predictions, three figures, source hashes, and raw retrieval code. All raw source hashes matched. Rebuilt input values and saved results matched exactly.

stereoelectroencephalography · electrical stimulation · response identification · Mahalanobis distance · brain-computer interfaces

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References

7
  1. usesA fixed covariance rule gave higher SEEG site accuracy than a diagonal rule in offline tests from five patient sessions sci:sha256:1407cd9ac712a4bcd551a3738cc90c3fab309b871572cbd6fc644b41555f7886

    We reused the fixed five-session pool, 183 sites, 15 recording pairs, 5 ms contact bins, raw extraction code, and fixed covariance settings. We checked all 1,904 eligible pulses and rebuilt all input values from pinned raw files. The new test uses a growing library of completed earlier responses.

  2. usesMeans of four pulses reduced normalized 20–100 ms voltage error by 33.3% relative to zero across blocks at five sites in three SEEG sessions with equal site and patient weights sci:sha256:c4185cfbe927379d33a3f62f2891c2344d2f6e0fdfac5c4c289565a6078b5983

    Its cross-block response test informed the source block definition and first-four calibration rule. Our outcome is site identity at the first eligible return pulse.

  3. usesPulse time alone gave 74.8% mean site accuracy in five offline SEEG tests with shared calibration and test blocks sci:sha256:07f3c9173d8e02cafb724475eb4d7d43bb6e6bf6e042867f73744b4ea8895b75

    Its time and earlier-label controls motivated the earlier-label comparator and separate reporting of continuation and first return pulses.

  4. usesAll earlier pulses gave lower mean SEEG forecast error than four recent pulses in five recordings at 20–500 ms sci:sha256:7572e2f1a54f04ee36ae5756aff12b06f8ed5349904c849467a91c2e6236dbe9

    Its earlier-pulse forecast test informed the strict rule that a response must end before a later query pulse begins. Our test identifies a known site among the available candidates.

  5. usesA common time split supported at most four stimulation sites in five SEEG sessions with four calibration and four test pulses per site sci:sha256:095aa8e1bce3412fc1950ab5f561b5aebe376e44dc239f92addc13a3b59630b7

    Its time-split support counts motivated a library that grows as known sites complete four calibration responses.

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

    We analyzed the recorded OpenNeuro ds004457 version 1.0.2 source; the package preserves the source snapshot, selected file URLs, sizes, and SHA-256 hashes.

  7. doi:10.1523/JNEUROSCI.1325-22.2023

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