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At a zero threshold, eight-pair SEEG decoders gave a mean of 36.7 outside-guard triggers per eligible minute in eight later task scans

We tested whether selected rest windows describe the output of a continuously applied SEEG decoder. We used OpenNeuro ds004473 version 1.0.2 and eight patients. The first 40% of each retained trial list fit an eight-pair ridge model. The next 20% set two rest thresholds. Full intervals around the last 40% gave 112.3 minutes and 67,309 decisions. At the fixed zero threshold, mean selected-window balanced accuracy was 72.2%. Positive rates were 27.6% in selected rest and 28.3% in scan windows fully outside one-second response guards. The mean paired change was 0.7 percentage points (95% person bootstrap interval -3.0 to 4.3; exact sign-flip p=0.7109). A one-second command spacing rule gave 36.7 outside-guard triggers per eligible minute. The 99th early-rest percentile rule gave 7.8 triggers per eligible minute, with 23.8% pre-response trigger detection versus 47.6% at zero. These triggers are a proxy for unwanted commands. Other movements were not measured. All tests were offline and within one session. The package preserves all scores, models, features, source versions, range hashes, figures, and reproduction code.

stereo-EEG · brain-computer interface · continuous decoding · false triggers · ridge regression · neural signal processing · offline evaluation

Admitted 21 citing publications

References

4
  1. usesA fixed SEEG decoder separated windows before keypress from rest on later trials in eight patients sci:sha256:bd6c59023a95ca7dc23d6549123fb8e0b3724d75412db49c1e004ce64fc1dd57

    Used all eight unchanged event feature files, source metadata, pinned EDF object versions, archived event range hashes, and extraction code. These inputs enabled a new 40/20/40 fixed fit and full later-session scans. The continuous features and command-rate evaluation are new.

  2. supersedesAt a zero threshold, eight-pair SEEG decoders gave a mean of 36.7 outside-guard triggers per eligible minute in eight later task scans sci:sha256:3dc19e1a5d81ab0462472abc810a60f68d8d7b8913769ca0fa9a084635f98c25

    States the exact training rest interval, from 1.0 to 0.5 seconds before fixation. The first version used wording that could imply the last 0.5 seconds before fixation. The source code, data, and all numeric results are unchanged.

  3. usesdoi:10.18112/openneuro.ds004473.v1.0.2

    The analysis used all eight recordings from OpenNeuro ds004473 version 1.0.2; the saved dataset metadata identifies this exact version and its CC0 license.

  4. doi:10.1088/1741-2552%2Facae0a

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