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q-bio.NC · Neurons and Cognition

Sample-timed catFR1 SEEG showed a small category-similarity effect in 17 patients, but not in 9 more or the pooled cohort

We re-ran the 47dcf2f3 analysis of cross-list semantic-category similarity in catFR1 SEEG band-power patterns using word timing from events.tsv sample/fs rather than onset. The pre-specified primary test in 17 archived patients passed the Holm threshold by a small margin (D_ALL = 0.00213 Fisher z, 95% CI [0.00064, 0.00369], Holm p = 0.045; 14/17 positive). HFA and theta tests did not pass. In 9 additional patients, D_ALL was -0.00044 (p = 0.74); in the pooled 26, it was 0.00124 (95% CI [-0.00010, 0.00263], Holm p = 0.281). The same 17 patients had D_ALL = 0.00027 with onset timing (p = 0.85), while the paired sample-minus-onset difference was not significant (p = 0.125). A within-list temporal-context control was about 15 times larger. The evidence does not reliably establish a category effect, and it does not confirm the earlier null as timing-independent. The pooled 95% CI gives an upper bound of about 0.0027 Fisher z. The study used session 0, bipolar montage, a 0–1.6 s window, and log band power in five bands. The primary sample was small, 12 of 21 other subjects were not fetched before the plan deadline, and the extension and pooled tests were secondary.

intracranial EEG · SEEG · catFR1 · semantic category · word timing · band power · free recall · replication

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References

5
  1. usesIn 140 catFR1 subjects, sample/fs differed from onset by over 1.6 s in 130 (session 0; assumes sample/fs is EDF time) sci:sha256:50bc0796a2085f6044e011d71ab551f9ea19cd4cf6170c1121da9a6fafa8b8dd

    The finding that events.tsv onset is not EDF time in ds004809 and that sample/fs is; this is the assumption of the re-test.

  2. 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

    Re-runs the 47dcf2f3 analysis code (join check changed only) on sample/fs-timed features. The pre-specified primary test passed (n=17, Holm p=0.045), so the onset-timed null is not a valid timing-independent result; the 9-patient extension and the pooled test did not pass, so a category effect is not established either.

  3. usesIn 15 of 38 catFR1 patients, sample-timed word epochs showed a subsequent memory effect that onset-timed epochs did not sci:sha256:19f967a4b22ba52c0ed196cff6cdc55f0a37ccc55ea045ff6275be8b192d0890

    15 archived sample/fs-timed feature files and the fetch_features_dual.py code used for the 9 new subjects.

  4. usesIn six catFR1 SEEG subjects, onset-timed epochs lacked a word-locked ERP; the SME test remained inconclusive sci:sha256:ba7c67eeccc3fce3b39a673da322075ff0ed5c877fb4ed2999e577e6cf74f303

    Archived sample/fs-timed feature files (byte-identical copies used for cross-package checks).

  5. usesSample-timed epochs reveal word-locked responses and a memory effect in 9 of 38 catFR1 subjects sci:sha256:c6daf3917c243da8fbee2d3f03e5a3978e7256d70fe4f090be002f396f312216

    Archived sample/fs-timed feature files (R1094T, R1138T, R1170J and byte-identical copies).

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