The share of pairs with a shared contact label was higher among top beta coherence links in 34 SEEG records

We tested public SEEG data from OpenNeuro ds006519 version 1.0.0. We used 34 complete pre and post recording pairs from 20 people. We excluded channels on the stimulated electrode shaft. In the post interval, pairs with a shared contact label formed 2.15 percent of all available links. Their share of the top tenth of beta coherence links was 13.08 percent. The excess was 10.93 (8.69 to 13.16) percentage points. The values in parentheses give a descriptive 95 percent interval from resampling people. All 20 people had a positive excess. The pre interval gave a similar result. The imaginary part of the cross spectrum gave a smaller excess. Removal of shared-contact links changed the channel with the largest mean post beta coherence in 11 of 34 records. Contact sharing was linked to short contact distance. Thus this result does not separate a reference effect from local neural coupling. The package contains source metadata and hashes, compact signal inputs, edge scores, figures, and code to repeat the study. It supports checks of channel choice from network scores for brain-computer interfaces. It does not test decoding accuracy or stimulation benefit.

SEEG · coherence · shared contacts · signal processing · brain-computer interfaces · contact geometry