Generator localization by current source density (CSD): Implications of volume conduction and field closure at intracranial and scalp resolutions

► Current source density (CSD) methodology represents a common bridge between scalp-recorded EEG and intracranial local field potential recordings. ► CSD reduces the redundancy, ambiguity, and reference-dependency of volume-conducted EEG measures at all observational scales. ► CSD scalp topographies identify essential constraints on plausible neuroanatomical generators.