A method and system are presented to address quantitative assessment of facial emotion nulling of a subject, where the method comprises the steps of: (1) presenting at least one scene, comprising a single facial expressions and a background, to a subject on a display (2) adjusting the facial expression on the scene (3) receiving feedback from the subject via at least one input device (4) quantitatively refining the received feedback (5) modulating the adjusted facial expression relative to the accuracy of the quantitatively refined feedback (6) transforming the modulated facial expression (7) calculating a critical threshold parameter and (8) recording a critical threshold parameter onto a tangible computer readable medium.
