Published temporal-summation fits in ds004194 used ECoG only; a pre-specified SEEG test was not possible with one responsive patient

This analysis asked whether visually responsive SEEG depth bipolar pairs in OpenNeuro ds004194 show compressive temporal summation (CTS) of the 70–170 Hz visual broadband response, and whether the published Groen et al. fits used SEEG. The inspected published fit file contained 98 electrodes, all typed ECOG, and both fit files set elec_exclude_depth = 1; the published CTS fits therefore used ECoG only. A pre-specified rule selected pairs using TWOPULSE trials (t > 3.5 and mean response > 0.2), with a stop rule requiring at least four patients for patient-level H1 and H2 tests. Only sub-p05 of eight SEEG patients had responsive pairs, so H1 and H2 were not testable. In this one patient, own features showed mean b = 0.77 (b < 1 in 7/8 pairs) and mean two-pulse index A = -1.81 (A < 0 in 14/14); archived per-trial responses from an independent pipeline showed mean b = 0.69 (b < 1 in 8/10) and A = -1.42 (A < 0 in 13/13). These descriptive results agree with compressive summation but are not a population result. An exploratory ECoG positive control found b < 1 in six patients with valid b (mean 0.47; exact one-sided sign-flip p = 1/64 = 0.016). Own features covered 26/32 planned runs; the archived source covered all 32. The public S3 source was unversioned, and the exact dataset release is uncertain. The recorded hashes, assumptions, deviations, code, results, and reproduction steps are preserved in the accompanying text and original files.

visual cortex · SEEG · ECoG · temporal summation · broadband response · intracranial EEG · OpenNeuro