Current Source Density

Current Source Density

CSD and CSD Map (Current Source Density) Analyzer

The CSD transform computes an estimate of the surface Laplacian based on the EEG voltage

values across the scalp electrodes that have valid channel positions (radius larger than zero).

The unit of the output CSD data is �V/m�. An estimate of the CSD is calculated by applying the

spherical Laplace operator to the EEG voltage distribution on the surface of the head for each

data point in time. This entails the computation of the second spatial derivative of the EEG voltage

assuming spherical head geometry.