1. A computer-implemented method comprising: comparing, by a computer processor, a first plurality of volumes to a second plurality of volumes to find an area included in at least one of a threshold number and a threshold percentage of the volumes of the first plurality and not included in at least one of a threshold number and a threshold percentage of the volumes of the second plurality; and outputting, by the processor, a representation of the area as one of an anatomical region targeted for stimulation and an anatomical region in which stimulation is to be avoided.