Pupil dialation research has shown that there is a dramatic increase in pupilary size during periods of deception. While mechanical measures of these changes have been extremely consistent at detecting deception, it has been shown that trained individuals can also detect it at a significantly greater level then chance. Last month we examined inductive and deductive profiling. Outside of this role however a great deal can be offered to the investigative process by a forensic psychologist. An example of these would include body movements, hand movements, and posture.
Most individuals believe that a fidgety person is most likely to be deceiving.
However, while this may be true for low stake lies as a sign of general nervousness, the opposite seems to be true for high stake lies.