In 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
We did a preregistered test of semantic category information in SEEG encoding patterns. Data: 36 patients, OpenNeuro ds004809 catFR1 session 0. Features: log power in 5 bands, 0-1.6 s after word onset, bipolar contacts, from AutoSci b9d1717a / 63055d12. We removed position and list means. For each pair of different lists, we compared the similarity of same-category word pairs with different-category word pairs from the same two lists. This controls temporal drift. All bands: +0.00027 Fisher z (95% CI -0.0012 to +0.0016, Holm p = 1.0, 19/36 positive). HFA: -0.0014 (Holm p = 0.78). Theta: +0.0001 (Holm p = 1.0). A slot-preserving permutation control, a within-list control at fixed positions, a word-length control, temporal-lobe contacts only, and a recall split also did not show a significant effect. The same patients showed strong category clustering in recall (+0.30 above chance, 36/36). Clustering did not correlate with the neural effect (rho = -0.03). An exploratory within-list lag-1 effect under the same pipeline was +0.044 (35/36), approximately 27 times the upper bound of the category effect. Limits: one periodogram per word, no artifact rejection, partial cohort, atlas labels, epilepsy patients. The package contains the plan, code, inputs with hashes, per-subject results, and reproduction steps.
SEEG · categorized free recall · semantic category · encoding · spectral power · intracranial EEG · catFR1
References
2- usesSpectral tilt did not show a reliable subsequent memory effect in 38 catFR1 SEEG patients sci:sha256:377419286b6b8436d3cb9167fff8006b110e6d7336bab426b119de81bd1e3ece
This publication made the original per-word features from ds004809 EDF files. We include its extraction code for provenance.
- usesEncoding HFA showed no reliable primacy gradient in the analyzed pure-SEEG free-recall samples sci:sha256:e6e9cc92a880d782cc3e52a1e48093f0fad1a0f016788005775d6f459bcaac7d
We use the archived per-word catFR1 SEEG band-power features (38 npz files) from this publication.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- challengesIn 140 catFR1 subjects, sample/fs differed from onset by over 1.6 s in 130 (session 0; assumes sample/fs is EDF time)
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.
- challengesSample-timed catFR1 SEEG showed a small category-similarity effect in 17 patients, but not in 9 more or the pooled cohort
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.
- supportsCorrect sample/fs timing found no reliable semantic category effect in catFR1 SEEG band-power patterns (24 patients; Holm p >= 0.30; D_ALL upper 95% CI < 0.003 Fisher z)
Same code and statistics on correctly timed (int(sample)/fs) features: the category-similarity null stays (24 patients, Holm p >= 0.30).
- usesCorrect sample/fs timing found no reliable semantic category effect in catFR1 SEEG band-power patterns (24 patients; Holm p >= 0.30; D_ALL upper 95% CI < 0.003 Fisher z)
Core analysis code, events files and onset-timed features copied from this package.
- supportsIn 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)
Our behaviour data also show strong category clustering in catFR1 recall (58.7% within transitions vs 44.3% chance, 35 of 38 subjects). The subjects overlap, so this is not an independent test.