Use of the model statement in determining the veracity of opinions

Abstract

AbstractWe examined the efficacy of a Model Statement to detect opinion lies. A total of 93 participants discussed their opinion about the recent strikes on two occasions, 1 week apart. In one interview they told the truth and in the other interview they lied. Each interview consisted of two phases. In Phase 1 they discussed their alleged opinion (truth or lie as appropriate). They then either listened to a Model Statement (a detailed account of someone discussing an opinion about a topic unrelated to strike actions) and expressed their opinion again in Phase 2 (Model Statement present condition) or they discussed their opinion again without listening to a Model Statement (Model Statement absent condition). The verbal cues examined were pro‐opinion arguments, anti‐opinion arguments, plausibility, immediacy, directness, clarity, and predictability. The truthful statements sounded more plausible in Phases 1 and 2 than the deceptive statements, providing further evidence that plausibility is a strong veracity indicator. The truthful statements included more pro‐arguments and sounded more immediate and direct than the deceptive statements, but only in Phase 2. The Model Statement had no effect. Reasons for the Model Statement null‐effect are discussed.