Introducing the high-context communication style interview protocol to detect deception in pairs

In four experiments, we examined whether pairs of truth tellers could be distinguished from pairs of lie tellers by taking advantage of the fact that only pairs of truth tellers can refer to shared events by using brief expressions (high-context communication style). In Experiments 1 and 2, pairs of friends and pairs of strangers pretending to be friends answered (i) questions they likely had expected to be asked (e.g., ‘How did you first meet’?) and (ii) unexpected questions (e.g., ‘First, describe a shared event in a few words. Then elaborate on it’). Pairs were interviewed individually (Experiment 1, N = 134 individuals) or collectively (Experiment 2, N = 130 individuals). Transcripts were coded for the verbal cues details, complications, plausibility, predictability, and overlap (Experiment 1 only) or repetitions (Experiment 2 only). In two lie detection experiments observers read the individual transcripts in Experiment 3 (N = 146) or the collective transcripts in Experiment 4 (N = 138). The verbal cues were more diagnostic of veracity and observers were better at distinguishing between truths and lies in the unexpected than in the expected questions condition, but only when the pair members were interviewed individually.