1. A computer-implemented method of outputting information concerning an electrode inserted inside a patient's neural tissue, the method comprising: determining, by a computer processor, a distribution of electrical values, to be generated by the inserted electrode, in the patient's neural tissue in a region surrounding the inserted electrode; determining at least one threshold electrical value for neural tissue activation; determining, by the processor and by applying the at least one threshold value to the electrical values, an estimated volume of neural tissue activated by the distribution of electrical values; and displaying, by the processor, a graphical representation of the determined estimated volume relative to an anatomical atlas that is specific to the patient and is generated by: registering imaging data representing an anatomy of the patient's neural tissue to a canonical anatomical atlas by performing a transformation; and performing an inverse of the transformation on the canonical anatomical atlas.