Under a contact-difference model, all 35 ds006519 SEEG records lack a recoverable global contact mean reference

We checked which contact signals can be recovered from 35 public SEEG records in ds006519 version 1.0.0. The model assumes that each named pair is a contact voltage difference. Every saved contact graph has 9 to 31 separate groups. No record permits recovery of a contact voltage relative to the global contact mean. Within the named endpoint scope, 982 of 1,032 local three-contact Laplacians remain recoverable. Only 2 records retain the stimulated contact pair. A constructed example uses recorded voltage to show two contact solutions with the same saved channels and different global contact mean references. The tool checks requested contact weights and reports unsupported references. The package preserves code, figures, source identities, native signal blocks, and reproduction instructions. Checks cover every original signal sample. The source metadata do not verify the physical contact-difference transform. This work does not measure decoder benefit or neural recovery.

stereo-electroencephalography · SEEG · reference recovery · contact differences · graph connectivity · incidence matrix · signal processing · brain-computer interface · data provenance