The verifiability approach to deception detection: A Preregistered direct replication of the information protocol condition of Nahari, Vrij, and Fisher (2014)
Nahari, Vrij, and Fischer (2014) found that, when participants were forewarned that their statements would be checked for verifiable details, truth tellers gave much more verifiable details than liars (d = 1.14 [95% CI: 0.49; 1.78]). In this direct replication (n = 72), all participants wrote a statement claiming they had carried out their regular campus activities, whereas liars had actually stolen an exam. Statements were coded for verifiable details. Our primary prediction was confirmed: Truth tellers provided significantly more verifiable details than liars (d = 0.50 [95% CI: 0.02; 0.98]). Our secondary predictions - that liars would provide more unverifiable details than truth tellers, and that truth tellers would have a higher verifiable to unverifiable ratio score than liars - were not confirmed. We hope this will stimulate other independent investigations of VA to tell whether or not coding for verifiability will pass Ockham´s razor test.