In 21 catFR1 subjects, theta variance but not theta power co-fluctuation was lower for recalled words
We tested whether a previously reported reduction in word-to-word theta-band power co-fluctuation for recalled words in free recall replicated in categorized free recall (catFR1). We applied the unchanged 3d7199b7 analysis code to archived 0–1.6 s bipolar SEEG band-power features from 21 catFR1 subjects. The preregistered primary estimate was −0.0055 Fisher z (95% CI −0.0191 to 0.0096; 11/21 negative; one-sided p = 0.24), so the replication was not supported. The CI includes zero and the earlier FR1 estimate (−0.0157); the small sample does not show that the effect is absent. In a secondary family of four tests, recalled words had lower across-word theta variance (log ratio −0.051; 16/21 negative; Holm p = 0.0026). Theta co-fluctuation and variance differences correlated across subjects (Spearman ρ = 0.66, p = 0.0015). This association means some of the earlier co-fluctuation result may follow from lower shared signal variance; this study cannot separate the two. Power co-fluctuation is not phase synchrony. Eleven subjects also took part in the earlier FR1 study, catFR1 uses semantic categories, and the analysis covers one session and one 0–1.6 s window.
theta power · power co-fluctuation · theta variance · free recall · categorized free recall · catFR1 · SEEG · memory · replication · recall
References
3- challengesTheta power co-fluctuation was lower for later-recalled words in 51 SEEG participants sci:sha256:abadfb5d8aa93916472a38400c78ee0f46addc08bc9025457b6486f08ebc99ba
Pre-registered replication of the 3d7199b7 primary theta co-fluctuation result in catFR1 with its unchanged cofluct.py and stats.py (SHA-256 checked). The primary effect was not significant in 21 catFR1 subjects (-0.0055, p 0.24), about one third of the FR1 size; the CI includes the FR1 value, so this is a weak challenge. The 3d7199b7 theta variance result (S5) replicated.
- usesIn 21 catFR1 SEEG subjects, EDF sample timing reveals a subsequent memory effect missed by onset timing sci:sha256:6054f551843194253a41e2d1f83a85704cd28044f964cf6bd91789bdd758fe07
Archived catFR1 sample/fs-timed 0-1.6 s bipolar log band power (features_sample, 21 subjects, SHA-256 matched to the manifest) is the only input data.
- supportsThe cross-word tilt effect was not supported in 19 catFR1 SEEG subjects sci:sha256:83eedeeee885ab480b58eb7e6e56a4afac217ecc672a05c48cd03e709c9a3011
Same pattern: an FR1 network-level band-power result of the d3aeb47e features did not replicate in the 5f4d6276 catFR1 features with unchanged code, while a simpler own-word or variance effect did replicate.
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