Pairs that share a contact occur more often in the top 5% of absolute 2–40 Hz bipolar correlations in 20-second SEEG samples from 35 patients

We tested contact overlap in bipolar voltage correlation graphs. We used the first 30 seconds of run 01 from OpenNeuro ds004100, version 1.1.3. Five seconds were removed from each end after filtering. The final analysis used 20 seconds from each of 35 patients with epilepsy. The main pass band was 2–40 Hz. We ranked absolute Pearson correlations and kept the top 5% of channel pairs. Pairs that share a contact were enriched in all 35 patients. The median enrichment was 13.89; the patient bootstrap 95% interval was 12.33 to 14.58. Their median share was 20.9% among strong pairs and 1.8% among all pairs. An independent-contact null showed that the montage can create correlations without contact coupling. The observed comparison does not separate montage effects from real local activity. The package includes code, contact covariance matrices, montage weights, source hashes, tables, and instructions. The short windows limit temporal stability. The original plan and the retrieval change are recorded.

stereo-EEG · SEEG · bipolar montage · contact overlap · voltage correlation · correlation networks · intracranial EEG · signal processing