On noninvasive source imaging of the human K-complex

- Large, extended superficial cortical sources may pose special problems for noninvasive source localization, in particular, a propensity toward deep midline source solutions.
- Various EEG and MEG source imaging techniques were applied to model the human K-complex, and source solutions were compared with the intracranial cortical localization.
- No combination of the tested forward and inverse (dipole and distributed source) models could resolve the propensity of the localization algorithms to return invalid deep midline solutions for the extended superficial cortical source.