Studies in which people are tested for detecting lies have shown that most of the population seems to have poorly developed lie-detection skills. The goal of this study was to assess the effect of feedback given after each judgment on lie detection, with extended exposure to an experimental situation in which detector and sender interacted face-to-face. Results showed that feedback led to performance improvement for all detectors, with accuracy rates up to 100% in a single session. However, detectors' performance showed little stability, and the data about generalization to other senders were inconclusive. Independent measures of senders' behavior didn't reveal consistent differences between truths and lies, even though post-experimental reports have pointed in this direction. The importance of an individualized data analysis and the need for experimental designs that isolate learning of detector and sender were discussed.
detection; lie; training; feedback
