Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Computation of surface Laplacian. (a) Electric potential on the scalp electrodes from two single source dipoles, located in the primary auditory cortices, (b) spline interpolation of electric potential on a rectangular grid (c) surface Laplacian calculated from (b) using a finite difference method. The mask is derived from a linear interpolation of the potential on the electrodes (see text for details).
