Cognitive interviews are often preferred because of the explicit information attained. An interviewer will typically focus on temporal and spatial questions to elicit this information. So, once your interviewee’s descriptive verbiage begins, how do you know if you are receiving completely accurate information?
Ramp up the cognitive load and the verbal and nonverbal deceptive cues will emerge! Whoa, not so fast. What if your interviewee is completely comfortable telling tall tales? Requesting temporal and spatial details may not trigger extra cognitive load. They may rely on
established schema or rehearsed scenarios to dilute the effects of extra mental strain.
However, splitting their attention may do the trick. Diverge from maintaining eye contact and flip flop around with questions that do not seem to follow a normal sequence. This split-attention effect will make relying on schema more difficult and “new” scenarios will need to be created, for those interviewees with deceptive tendencies. In turn, cognitive load will be induced and deceptive cues will emerge.
What about interviewees telling the truth? This technique will also induce mental strain, but most truth tellers usually respond to cognitive load with less descriptive and shorter answers. If they receive positive feedback from the interviewer, the cognitive load will also be lessened. Unlike the deceptive interviewee, the truthful interviewee is not pressured to monitor feedback, verbiage, and possible deceptive cues.