Individual and Small Group Accuracy in Judging Truthful and Deceptive Communication

We examined accuracy in detecting the truths and lies of 10 videotaped students who offered their opinions on the death penalty or smoking in public. Student lie detectors were randomly assigned to either the individual condition, where they reported their veracity judgments and confidence independently, or the small group condition, where they recorded their judgments privately and then deliberated with 5 other students before making a consensus judgment of lie, truth, or hung. Results indicated that small group judgments were more accurate than individual judgments when judging deceptive but not truthful communication. Small group individuals also reported greater confidence in their abilities after the task. Finally, groups with a greater number of hung judgments were more accurate, likely due to their employing hung judgments for the most difficult to judge stimulus communicators. These results raise implications for real life group judgments, particularly in light of the increasing availability of technology.