Reality monitoring in the forensic context: Digging deeper into the speech of liars.

Reality monitoring (RM) indicates that truthful accounts contain more perceptual and contextual details than false accounts. Considering the tendency of liars to manipulate their accounts by adding false details, I compared truths and lies in terms of the amount and veracity of details provided by suspects across three conditions: a single statement provided immediately; a single statement following a two-week delay; or two statements, the first provided immediately and the second following a two-week delay. Distinguishing truths from lies was possible across conditions, but with varying intensity. Truth-tellers provided only truthful details, whereas liars provided both truthful and false details. While the opportunity to provide truthful details decreased over time for both truth-tellers and liars, only the latter compensated for this decrease by adding false details. The current study provides a new empirical approach and significant insight into the application of the RM framework in the forensic context.