This article summarizes a THE LIBRARY EP.225 discussion about reading people through psychology and body language, then explains what the 7-38-55 formula can and cannot tell us. A gesture or facial expression alone is not reliable proof of what someone thinks or whether they are lying.
What the video discusses
The discussion focuses on observing nonverbal behavior and interpreting it in context. This guide separates the ideas raised in the episode from the limits described in research, so that a reader does not treat a single cue as a reliable verdict about another person.
What does the 7-38-55 rule mean?
The figures 7%, 38%, and 55% are often repeated as if spoken words carry only 7% of meaning. That is broader than the original research supports. Albert Mehrabian explains that the formula came from experiments about communicating feelings and attitudes, such as liking or disliking, and should not be applied to every kind of communication. Two related studies were published in 1967: Decoding of Inconsistent Communications and Inference of Attitudes from Nonverbal Communication in Two Channels.
The formula therefore does not mean that words account for only 7% of all communication, and it is not a lie-detection formula. It should not replace listening to what someone actually says or checking evidence.
How reliably can body language detect a lie?
The National Research Council’s review, The Polygraph and Lie Detection, Chapter 6, reports that meta-analyses did not find a generally reliable pattern of facial or bodily movements that signals deception. Research also did not find a consistent relationship between lying and the belief that liars tend to avoid eye contact. The review notes that most people, including many with legal experience, are not markedly better than chance at judging deception from behavior.
Anxiety, tiredness, cultural differences, disability or sensory differences, and the context of a conversation can all affect behavior. Seeing one behavior does not reveal its cause. Even several cues together should be checked against other information and evidence; do not accuse or judge someone from body language alone.
How to observe without jumping to conclusions
- Describe what you observe before interpreting it. For example, say “they paused and looked down,” rather than “they are lying.”
- Consider the context. Ask whether another explanation could account for the behavior, and do not assume everyone expresses emotion in the same way.
- Ask open questions. Use neutral questions that let the other person explain, rather than leading or accusing them.
- Check information separately from behavior. For an important decision, follow the appropriate process and consider documents, facts, and sources that can be verified.
Frequently asked questions
Does avoiding eye contact mean someone is lying?
No. The research summarized by the National Research Council does not support avoiding eye contact as a generally reliable sign of deception.
Does the 7-38-55 rule apply to every kind of communication?
No. The researchers described the figures as coming from experiments about communicating feelings and attitudes, not as percentages that explain the meaning of every conversation.