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q-bio.NC · Neurons and Cognition

The test did not detect a positive time relation for SEEG waveform distance at 20 to 500 ms in eight sessions under log count control and joint pulse exchangeability

We tested whether SEEG waveform distance increased with elapsed time after a log pulse-count control. We used public OpenNeuro ds004696 version 1.0.1. Eight patient sessions supplied 886 bipolar readouts at 86 stimulation sites. Each readout used the first five and final five source-good pulses. We measured squared voltage distance for all 45 pulse pairs in the 20 to 500 ms window. We removed the linear relation between log time and log good-pulse rank separation from time. The mean normalized score was 0.0094. A descriptive 95 percent patient bootstrap interval was -0.0137 to 0.0346. The one-sided joint pulse permutation test gave p = 0.25345. The test requires joint pulse exchangeability within each patient, conditional on selection and timing. It did not detect the planned positive relation under this assumption. This is not evidence that the signals are constant or that a timer can set interface calibration. At the median site, only 1.43 percent of log-time variance remained after count control. This limits the separation of time and count relations. The package includes three figures, exact trial products, all scores and null draws, code, a fixed local plan, source hashes, and retrieval instructions. Two full public source derivatives rebuilt the saved inputs exactly. The result addresses a calibration question for reading brain responses after stimulation. It does not test an operating brain-computer interface.

stereoelectroencephalography · electrical brain stimulation · waveform distance · pulse count · calibration · joint exchangeability

Admitted 1 citing publication

References

7
  1. usesFive early waveforms retained 61.2 percent of later SEEG energy with measured later coefficients in eight patient sessions sci:sha256:f320cac583342c3b2c87eb09853c632edf930881f39a036fb115c2088eba7e28

    We used its exact ten-pulse Gram products, contact tables, and source metadata to test elapsed time and good-pulse count.

  2. usesWith the same fit rule, the latest five retained SEEG responses reduced mean forecast error by 1.1 percent against random sets of five at 20 to 500 ms in eight patient sessions sci:sha256:0c97ffc54bebbe1fc1f117cd98063de228096c44c2ccc6a3740218015fc38e51

    Its recent-versus-random waveform comparison motivated the timing question. Its result values did not enter the new scores.

  3. usesA five-pulse check selected more repeatable bipolar SEEG pairs within eight epilepsy patient sessions sci:sha256:b5b7963746f5c6d2a2a8f7844ec590732a4eb152bc7a70979b3bc95c3e27820f

    We used its public-source retrieval and extraction code. We also used its source-code records and pinned file hashes.

  4. usesRecorded pulse gaps from 2 to 8 seconds had no clear mean SEEG gain relation in eight sessions with site and order controls sci:sha256:77ca2cd94f79de36a61ae64814637757c4181c890e0e63769f25e428fe358ac5

    Its pulse-gap and response-gain study motivated separate checks of elapsed time and good-pulse count. The new outcome is waveform distance.

  5. usesA joint pulse exchangeability test did not detect excess SEEG waveform separation at 20 to 500 ms in eight patient sessions sci:sha256:cedc3626502107ece258475063f448afe88f13e28f33cfeeefc02a1529f3df8f

    We used its common patient pulse permutation test structure. We tested all pulse-pair times with a log count control.

  6. usesdoi:10.18112/openneuro.ds004696.v1.0.1

    The analyzed public dataset was OpenNeuro ds004696 version 1.0.1; saved source hashes and URLs identify the derivatives used.

  7. doi:10.1523/JNEUROSCI.2201-22.2023

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