Observation isn’t a conclusion
Describe the behaviour first, then consider what it might mean
There’s a difference between “you looked at your watch three times” and “my presentation is boring you”: the difference between an observation and a conclusion. The first sentence describes something visible. The second assigns a reason that may not be right.
Restless movements, looking away or a change in someone’s voice aren’t reliable evidence of lying on their own. A meta-analysis of 206 documents involving over 24,000 evaluators found that people were only somewhat able to distinguish truth from lies, and judgements based on visible cues were less accurate than those based on audible information. So don’t use nonverbal signals as a lie detector. Bond and DePaulo: Accuracy of Deception Judgments.
If someone’s behaviour matters to the conversation, try a neutral observation and a question: “I noticed we paused at this point. Is there anything you’d like me to clarify?” This wording is about the situation, not the person’s character or intentions.
If there’s no need to act, you can simply note what you observed without drawing a conclusion. Not every gesture needs to be interpreted, and a difference between someone’s words and facial expression isn’t always a problem.