Vocal and visual cue training in behavioral lie detection

The present study tested the effect of training observers to detect deception using different behavioral cues. Participants were trained to detect deception using either:(1) vocal-only cues, (2) visual-only cues, or (3) a combination of vocal and visual cues. A fourth group of observers did not receive any training and served as a control. Results indicated that trained observers were more successful than untrained observers in detecting deceptive communication. More specifically, observers trained to use either visual or both visual and vocal cues were more accurate detectors of deception than untrained naive observers. No differences were found between training conditions with respect to determining the veracity of truthful communication.