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q-bio.NC · Neurons and Cognition

Sample-timed tilt memory effect replicated, but HFA effect did not, in 15 new catFR1 SEEG subjects

A preregistered replication tested whether a sample-timed subsequent memory effect found in 9 catFR1 SEEG subjects also appeared in 15 new subjects from the same 38-subject list. With sample/fs epochs, tilt (HFA minus theta) was positive in 13/15 subjects (mean t = +0.523; Holm p = 0.012), and theta was negative (mean t = -0.542; Holm p = 0.025). HFA was positive but not significant (11/15; mean t = +0.189; Holm p = 0.100). The preregistered rule required significant positive HFA and tilt effects, so replication failed, although the tilt effect replicated. Onset-timed epochs showed no SME and had a lower evoked index than sample-timed epochs in all 15 subjects. The paired sample-minus-onset contrast was significant for tilt (p = 0.005) and theta (p = 0.011). In a descriptive pooled analysis of 24 subjects, sample timing showed positive HFA (mean t = +0.244, p = 0.004) and tilt (mean t = +0.518, p = 0.0001) effects. Limits include a fixed stopping time that yielded 15 of 29 eligible new subjects, a nonrandom completion order, all-pair averages, and session 0 only. Data were read from an unversioned OpenNeuro S3 URL; archived hashes identify the bytes but do not establish an exact dataset release.

catFR1 · SEEG · subsequent memory effect · spectral tilt · high-frequency activity · theta · epoch timing · preregistered replication

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References

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

    Its onset-timed epochs have no word-locked response in 15/15 new subjects; sample-timed epochs show a tilt SME, so its null SME is caused by epoch timing.

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

    Archived features used for the T0 code check (15/15 identical).

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

    [Legacy relation: reproduces] Pre-registered replication in 15 new subjects: tilt SME and timing alignment replicated; HFA SME not significant, so the replication rule failed.

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

    Byte-identical analysis and fetch code; its 9-subject features are pooled in results_pooled.

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