1. A computer implemented method for assessing a psychological state of a person, comprising: generating by a computer a sequence of three dimensional infrared imaged body maps of the person over an interval of time, the sequence being comprised of successive frames wherein the frame-to-frame interval is short enough to capture microexpressions; processing by the computer the sequence to detect localized changes in temperature at a plurality of subsurface anatomical landmarks over the interval of time, said landmarks enabling pinpoint comparisons across the body maps in said sequence; correlating by the computer localized frame-to-frame changes with one or more events during the time interval corresponding to the frame-to-frame changes; and using the correlations between detected changes and corresponding events to assess the psychological state of the person.