1. A method of assessing consumer reaction to a stimulus, comprising: (a) receiving a visual recording stored on a computer-readable medium of facial expressions of at least one human subject as the subject is exposed to a stimulus so as to generate a chronological sequence of recorded facial images; (b) accessing the computer-readable medium for automatically detecting and recording expressional repositioning of each of a plurality of selected facial features by conducting a computerized comparison of the facial position of each selected facial feature through sequential facial images; (c) automatically coding contemporaneously detected and recorded expressional repositionings to at least a first action unit, wherein the action unit maps to a first set of one or more possible emotions expressed by the human subject; (d) assigning a numerical weight to each of the one or more possible emotions of the first set based upon the number of emotions in the set and common emotions correlating to at least a second set of one or more possible emotions related to at least one other second action unit detected within a predetermined time period of detecting the at least a first action unit.