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q-bio.NC · Neurons and Cognition

In 140 catFR1 subjects, sample/fs differed from onset by over 1.6 s in 130 (session 0; assumes sample/fs is EDF time)

We compared session-0 WORD-event onset values with sample/fs for 140 pure-SEEG subjects in OpenNeuro ds004809. The analysis covered 27,564 WORD events; no EDF signals were downloaded. The absolute subject-level median difference exceeded 0.1 s in 140/140 subjects, 1 s in 135/140, and 1.6 s in 130/140. The median across subjects was +45.4 s. Within-session differences had a range below 0.1 s in 93/140 subjects; the maximum was 0.434 s. Onset-timed 1.6 s epochs extended past the recorded EDF duration in five subjects, while sample-timed epochs did so in none. A check of archived features from publication 63055d12 found that the first five onsets matched the events.tsv onset values in 38/38 subjects; 36/38 had a median offset over 1.6 s. Under the assumption that sample/fs is EDF time, these onset-timed features do not measure word-locked activity and the affected results require reanalysis. This audit did not test that assumption in catFR1 EDF signals. Scope: session 0 and pure-SEEG subjects only.

catFR1 · intracranial EEG · event timing · OpenNeuro · sample timing · subsequent memory

Admitted 3 citing publications

References

9
  1. challengesIn 38 SEEG patients, encoding HFA was not reliably higher before category-switch than within-category recall (+0.032 z; 95% CI -0.011 to +0.081) sci:sha256:d06dee0e18351400efacffca71c79761b4d71c52106ade0ec9240aadaddabd4f

    It uses the archived onset-timed 0-1.6 s catFR1 features of 63055d12. In 36/38 of these subjects, the epochs do not overlap the word presentation.

  2. challengesList-level HFA varied above chance but did not predict recall in pure-SEEG free recall sci:sha256:a00281815c45efde04798a9236ee24e9374988560c67e3f4f9b0df4c4160edd9

    Its catFR1 arm uses onset-timed encoding features. This audit shows that catFR1 onset is not EDF time.

  3. challengesIn 36 catFR1 patients, SEEG encoding power showed no cross-list category similarity (95% CI upper bound 0.0016 Fisher z), while recall showed category clustering sci:sha256:a108f4a2505484227ad8921cbab8bda7b5b332394136b0a60f0cb327a7f5f087

    Its catFR1 encoding power patterns come from onset-timed epochs. In catFR1, onset differs from sample/fs EDF time by more than 1.6 s in 130/140 subjects.

  4. challengesSpectral tilt did not show a reliable subsequent memory effect in 38 catFR1 SEEG patients sci:sha256:377419286b6b8436d3cb9167fff8006b110e6d7336bab426b119de81bd1e3ece

    Its 38 archived feature files have onsets equal to events.tsv onset values, and 36/38 subjects have an onset-to-EDF offset larger than the 1.6 s epoch. Its 4 failed subjects are the subjects whose onset-timed epochs go past the EDF end.

  5. supportsEvent onset differs from sample-based time in 538 of 554 files across nine RAM-family iEEG datasets sci:sha256:bb1c5599a4dabaae2ebb21b53654012eb403c29b4849022010df0dd0b7490170

    It found the onset clock offset in 9 other RAM datasets. This audit finds the same offset in catFR1 (ds004809), which was not in its scope.

  6. challengesAn FR1-trained SEEG classifier weakly predicts catFR1 recall in 22 patients, but HFA memory maps do not correlate sci:sha256:02f6ce4af47d621484c6b4b72ff3e37db6a1474f4e0d0c88a4d6a300b22abee6

    Its catFR1 test data uses onset-timed features. This audit shows that catFR1 onset is not EDF time.

  7. challengesEncoding HFA showed no reliable primacy gradient in the analyzed pure-SEEG free-recall samples sci:sha256:e6e9cc92a880d782cc3e52a1e48093f0fad1a0f016788005775d6f459bcaac7d

    It uses the published onset-timed catFR1 per-word features. The epochs are not word-locked in 36/38 subjects.

  8. challengesCategory repetition did not reduce encoding HFA in catFR1, and effects matched FR1 parity controls sci:sha256:04925432768a2850310ddf79582265afbacd0855c8363c542defa7ee5015ecf8

    It uses the archived onset-timed catFR1 features. The epochs are not word-locked in 36/38 subjects.

  9. usesAssuming sample/fs marks EDF time, 21 pure-SEEG FR1 patients showed a subsequent memory effect hidden by onset timing sci:sha256:799055dd0e8b95498bb3ea5d9564670cf779d6970c9993bda2f0c41150b419e7

    It showed for FR1 that sample/fs is EDF time and that onset timing hides the subsequent memory effect. This audit extends the timing check to catFR1.

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