Body language terms: a glossary that separates the research from the seminar slides

You are standing at the edge of a room, waiting to join a conversation. Your arms are crossed because you are cold, but a video in your head has already declared you defensive. So you uncross them, adjust your shoulders, hold eye contact, and start running a checklist instead of listening.

Our position is simple: body language is a real research field with a fake popular version bolted on top. The useful skill is not performing a secret gesture. It is noticing the whole signal, in context, while staying present enough to respond like a person.

Key numbers

• 100 ms: 100-ms face judgments correlated highly with unlimited-time judgments. Read the paper.
• Eleven meta-analyses: Langlois and colleagues' review found agreement on attractiveness. Read the review.
• Two dimensions: Face judgments reduce largely to valence, or trustworthiness, and dominance. Read the PNAS paper.
• Two 1967 studies: Mehrabian tested conflicting words, tone, or facial expression about a speaker's feeling toward the listener, not communication in general. Read the vocal-tone study and the two-channel study.

Table of contents

• How to read this glossary
• The academic vocabulary
• What research actually found about reading people quickly
• Posture, presence and the power posing story
• The 7-38-55 problem
• Terms that circulate without a source
• What body language cannot do for a first impression
• The bottom line
• Sources

How to read this glossary

Every entry has one of three buckets. From the literature means a field term or measured finding used roughly as its research used it. Overstated means the finding is real but the popular claim outruns it. Seminar folklore means we could not trace the quoted version to a primary source.

Caveat: a glossary cannot tell you what one particular person feels from a single photograph or gesture. It can only stop you from starting with a bad premise.

The academic vocabulary

Kinesics — [From the literature] the study of body movement; no fixed meaning.

Proxemics — [From the literature] the study of interpersonal space; distance is relational, not an attraction meter.

Paralanguage — [From the literature] vocal features beyond words, such as tone.

Haptics — [From the literature] touch as communication; meaning depends on consent, relationship, setting, and timing.

Oculesics — [From the literature] the study of gaze. Eye contact signals are not a lie detector or consent signal.

Adaptors — [From the literature] gestures managing bodily tension or interaction demands; not diagnostic.

Illustrators — [From the literature] movements accompanying or clarifying speech; meaning depends on context.

Emblems — [From the literature] gestures with socially understood meaning; interpretation varies across groups.

Regulators — [From the literature] behaviors coordinating turn-taking.

Affect displays — [From the literature] expressions associated with emotion; genuine, managed, ambiguous, or misread.

Caveat: these labels give you a shared vocabulary. They do not justify attaching a percentage to a gesture, or claiming that a movement reliably exposes a hidden motive.

Photo: Nano Erdozain on Pexels

What research actually found about reading people quickly

Thin slicing — [From the literature] Ambady and Rosenthal's term for very brief expressive-behavior judgments; their meta-analysis found samples predicted outcomes better than chance.

Zero-acquaintance accuracy — [Overstated] strangers making accurate judgments with no prior acquaintance. Some judgments inform, but “accurate” is not “complete.”

Valence and dominance — [From the literature] dimensions underlying spontaneous face evaluation: valence, often read as trustworthiness, and dominance.

First-impression speed — [From the literature] Willis and Todorov found 100-ms judgments correlated highly with unlimited-time judgments across several traits.

Caveat: these studies do not give you a field manual for extracting personality from posture. They show that perception starts quickly and uses patterns, not that every pattern deserves your confidence.

Posture, presence and the power posing story

Power posing began with the claim that brief expansive poses could affect neuroendocrine levels and risk tolerance. Carney, Cuddy, and Yap reported that result in 2010.

Ranehill and colleagues' 2015 study found no effect on hormones or risk tolerance, while self-reported feelings of power did replicate. Posture may change how powerful you feel; stronger claims did not survive. How to stand up straight, how to walk with confidence, and a firm handshake help when they make movement comfortable, not theatrical.

Caveat: replication does not erase the original paper; it narrows what we should claim from it. We should keep the self-reported effect and retire the unsupported leap to hormones and risk tolerance.

The 7-38-55 problem

The famous 7-38-55 formula is not a measurement of communication. Mehrabian's two 1967 studies examined how listeners resolved a spoken word against tone or facial expression when judging the speaker's feeling toward the listener.

The studies produced the ingredients later retold as 7% words, 38% tone, and 55% body language. Those ratios came from two separate small studies and were later multiplied in popular retelling. Applying them to every conversation is a category error.

Popular 7-38-55 version — [Overstated] a real pair of studies inflated into a universal rule; weight depends on question and situation.

“93% of communication is non-verbal” — [Seminar folklore] not what the studies measured; a slogan that cannot erase language, content, culture, or context.

Ask what kind of message was tested. What is charisma is a better frame.

Caveat: rejecting the formula does not mean nonverbal behavior is irrelevant. It means relevance is not the same thing as a universal percentage.

Terms that circulate without a source

Crossed arms mean defensiveness — [Seminar folklore] no primary source showed crossed arms reliably indicate defensiveness. Cold, comfort, habit, and attention are also possible explanations.

Mirroring makes people like you — [Overstated] no primary source supports it as dependable. Deliberate copying can feel mechanical. How to be more approachable starts with responsiveness.

Looking up-left means lying — [Seminar folklore] no primary source supports this eye-direction rule. Direction alone cannot reliably reveal truthfulness.

You have seven seconds — [Seminar folklore] no primary source supports a universal seven-second deadline. First impressions can form rapidly, as the 100-ms face study shows, but no countdown tells you when updating stops.

Caveat: “no source located” is deliberately narrower than “false.” The responsible claim is about identifiable evidence, not omniscience.

What body language cannot do for a first impression

Body language cannot tell you exactly what someone thinks or guarantee attraction; it shapes information alongside appearance, words, situation, and expectations.

This is also where the advice should become humane. If you are anxious about your looks, do not turn every shoulder angle into a verdict about your worth; make one practical improvement, then return your attention to the person in front of you. Our first-impression guide treats the opening moment as information, not destiny.

Real World Appeal covers the missing axis: how your complete first impression may be perceived. You can test your first impression, see the result before deciding anything, and use it as a prompt for better choices. There is no paywall on your score. A report is a perception snapshot, not a diagnosis of your character or a guarantee about another person's response.

Photo: Mikhail Nilov on Pexels

The bottom line

Keep the terms, thin slicing, fast face judgments, and mixed power-posing result. Drop the universal 93% slogan, seven-second countdown, and gesture rules promising certainty. To see the perception axis applied to your first impression, try Real World Appeal.

Sources

Mehrabian, A., & Ferris, S. R. (1967). “Inference of attitudes from nonverbal communication in two channels.” Journal of Consulting Psychology, 31(3), 248-252. https://doi.org/10.1037/h0024648

Mehrabian, A., & Wiener, M. (1967). “Decoding of inconsistent communications.” Journal of Personality and Social Psychology, 6(1), 109-114. https://doi.org/10.1037/h0024532

Ambady, N., & Rosenthal, R. (1992). “Thin slices of expressive behavior as predictors of interpersonal consequences: A meta-analysis.” Psychological Bulletin, 111(2), 256-274. https://doi.org/10.1037/0033-2909.111.2.256

Carney, D. R., Cuddy, A. J. C., & Yap, A. J. (2010). “Power posing: brief nonverbal displays affect neuroendocrine levels and risk tolerance.” Psychological Science, 21(10), 1363-1368. https://doi.org/10.1177/0956797610383437

Ranehill, E., Dreber, A., Johannesson, M., Leiberg, S., Sul, S., & Weber, R. A. (2015). “Assessing the robustness of power posing: no effect on hormones and risk tolerance in a large sample of men and women.” Psychological Science, 26(5), 653-656. https://doi.org/10.1177/0956797614553946

Willis, J., & Todorov, A. (2006). “First impressions: making up your mind after a 100-ms exposure to a face.” Psychological Science, 17(7), 592-598. https://pubmed.ncbi.nlm.nih.gov/16866745/

Oosterhof, N. N., & Todorov, A. (2008). “The functional basis of face evaluation.” PNAS, 105(32), 11087-11092. https://doi.org/10.1073/pnas.0805664105

Asch, S. E. (1946). “Forming impressions of personality.” Journal of Abnormal and Social Psychology, 41(3), 258-290. https://doi.org/10.1037/h0055756

Aronson, E., Willerman, B., & Floyd, J. (1966). “The effect of a pratfall on increasing interpersonal attractiveness.” Psychonomic Science, 4(6), 227-228. https://doi.org/10.3758/BF03342263

Langlois, J. H., Kalakanis, L., Rubenstein, A. J., Larson, A., Hallam, M., & Smoot, M. (2000). “Maxims or myths of beauty? A meta-analytic and theoretical review.” Psychological Bulletin, 126(3), 390-423. https://pubmed.ncbi.nlm.nih.gov/10825783/