| Abstract: | The effectiveness of detection of deception was evaluated with a sample of 48 prisoners, half of whom were diagnosed psychopaths. Half of each group were “guilty” of taking $20 in a mock crime and half were “innocent.” An examiner who had no knowledge of the guilt or innocence of each subject conducted a field-type interview followed by a control question polygraph examination. Electrodermal, respiration, and cardiovascular activity was recorded, and field (semi-objective) and quantitative evaluations of the physiological responses were made. Field evaluations by the examiner produced 88% correct, 4% wrong, and 8% inconclusives. Excluding inconclusives, there were 96% correct decisions. Using blind quantitative scoring and field evaluations, significant discrimination between “guilty” and “innocent” subjects was obtained for a variety of electrodermal, respiration, and cardiovascular measures. Psychopaths were as easily detected as nonpsychopaths, and psychopaths showed evidence of stronger electrodermal responses and heart rate decelerations. The effectiveness of control question techniques in differentiating truth and deception was demonstrated in psychopathic and nonpsychopathic criminals in a mock crime situation, and the generalizability of the results to the field situation is discussed. |
