THIN SLICES OF EXPRESSIVE BEHAVIOR AS PREDICTORS OF INTERPERSONAL CONSEQUENCES - A METAANALYSIS

A meta-analysis was conducted on the accuracy of predictions of various objective outcomes in the areas of social and clinical psychology from short observations of expressive behavior (under 5 min). The overall effect size (r) for the accuracy of predictions for 38 different results was .39. Studies using longer periods of behavioral observation did not yield greater predictive accuracy; predictions based on observations under 1/2 min in length did not differ significantly from predictions based on 4- and 5-min observations. The type of behavioral channel (such as the face, speech, the body, tone of voice) on which the ratings were based was not related to the accuracy of predictions. Accuracy did not vary significantly between behaviors manipulated in a laboratory and more naturally occurring behavior. Last, effect sizes did not differ significantly for predictions in the areas of clinical psychology, social psychology, and the accuracy of detecting deception.