At any given moment in time, as human beings we tend to be either visually dominant or auditorily dominant—we’re either more aware of and processing what we’re seeing, or more aware of and processing what we’re hearing. The problem with that goes back to what we said about communication being both verbal and nonverbal in nature, which means that deceptive behavior can come in either or both forms. How do we capture both at the same time?
The trick is to train our brains to go into what we call “L-squared mode”—we have to tell it to look and listen simultaneously. We have to say, “Brain, for the next few seconds, you’re going to process in both the visual and auditory channels what’s being communicated to me.”