A technique that uses a camera to record the emission of radiant energy from the body. The basis for the technology is that any object with a temperature greater than 0 degrees Kelvin radiates energy in the infrared (IR) range. Although IR energy cannot be seen by the human eye, thermal cameras are equipped to record this form of energy. Changes in thermal patterns on the face have been shown to be associated with physiological arousal, and preliminary evidence suggests that thermal imaging can discriminate between truthtellers and deceivers at better than chance using a probable-lie comparison question technique. See: Pavlidis, Eberhardt & Levine (2002); Pollina (2006); Pollina & Ryan (2003).