Keeping 17 pairs removed return paths in all 88 ds004504 v1.0.9 EEG graphs at 10 Hz from the first 20 accepted windows with the equal mean reference of 19 channels

We tested all 88 processed EEG records in ds004504 v1.0.9. Each main test used the first 20 accepted windows at 10 Hz. It used the equal mean reference of 19 channels. Every signed edge in each full graph had a return path. We kept the 17 pairs with the largest absolute imaginary coherency. Each of the 88 graphs then had an edge without a return path. Pure source nodes and pure sink nodes each occurred in 87 records. A proof covers real, strictly positive reference weights and common observations. It uses every referenced channel. Positive channel powers are required for coherency. An audit tool reports omitted flow that balances retained net flow. We downloaded all 88 source files again and rebuilt the Fourier input byte for byte. Independent code checked 616 spectra and 4,928 graph masks. A clean installation gave the same graph counts within the stated numerical limits. The package preserves code, full Fourier input, source hashes, metadata, results, proof, and reproduction commands. Edge arrows represent matrix signs. They do not establish neural causes.

EEG · imaginary coherency · reference weights · directed graphs · circulation · return paths · flow certificates · OpenNeuro ds004504