1. An apparatus for registering neural activity, comprising: (a) a micro electrode array configured for application to a target tissue area for which neural activity is to be registered; (b) a computer processor coupled for controlling and processing signals from said micro electrode array; and (c) programming executable on the computer processor for performing steps including: (i) determining a weighting matrix, which spans an area of multiple electrode positions surrounding a center electrode position, for the micro electrode array based on a given electrode configuration; (ii) collecting neural signals from the micro electrode array; (iii) applying the weighting matrix to a window of collected neural signals to generate a superposition signal for the center electrode and its boundary area of recording power density; (iv) moving the window of the weighting matrix for different center electrode positions within the micro electrode array; and (v) registering neural activity for multiple electrodes in the micro electrode array to which said weighting matrix is applied in the moving window.