1. A method of a stimulation parameter selection machine, the method comprising: recording a definition of anatomical atlas structures in association with a patient anatomical space; displaying, by a processor of the machine, in a display, and in relation to a displayed representation of the defined anatomical atlas structures, a first volume of activation (VOA) corresponding to a first stimulation parameter set; in response to user input obtained via a user interface, displaying, in relation to the displayed representation of the defined anatomical atlas structures, a second VOA corresponding to the user input, wherein the user input is a user-selection of a point within the display; and in response to the user-selection: identifying based on the recorded definition, and automatically setting as a target stimulation region, by the processor, a first anatomical atlas structure of the defined anatomical atlas structures within the representation of which the user-selected point is located; based on the identifying, calculating, by the processor, a second stimulation parameter set to activate the first anatomical atlas structure, the second VOA being based on the second stimulation parameter set; and displaying, in the display, the second VOA and identifying, in the display, a side effect region that overlaps with the second VOA using a different color, shade, or hatching pattern than the first anatomical atlas structure that indicates to a user that stimulation of the side effect region can produce a side effect.