Proteans (or the Proteus effect) are unpredictable, subtle, often subconscious, flirting signals, such as a woman's touching of her hair when first meeting a man. The term was coined by Humphries and Driver in 1970 for unpredictable behaviour exhibited by prey animals. It was used in the context of human courtship behaviour by Grammer et al. in 2000.
The researchers named the ritual for the shape-shifting Greek god because of the ambiguity of the signals. The name also suggests a first impression, or something that precedes actual flirting. Because of the unconscious nature of proteans, they are not overt invitations to proceed, but more akin to "tells" in a poker game.
These signals often indicate that the sender is trying to decide whether he or she is interested in the "receiver". However, some individuals, instead of playing along, will overestimate the sender's interest and do something more obvious, like asking for a phone number. This can be clumsy and confusing to both parties, and understanding the concept of protean signals is useful for avoiding such missteps. Misinterpreting those cues and responding to them overeagerly is commonly said to happen to men more than women, although both can suffer when this happens.
- Humphries, D.A.; Driver, P. M. (1970), "Protean defence by prey animals", Oecologia, 5: 285–302, doi:10.1007/BF00815496
- Grammer, Karl; Kruck, Kirsten; Juette, Astrid; Fink, Bernhard (2000), "Non-verbal behaviour as courtship signals: the role of control and choice in selecting partners", Evolution and Human Behaviour, 21: 371–390, doi:10.1016/S1090-5138(00)00053-2, PMID 11146304
- Daily Times, Pakistan Mar 17 2003: Solved: flirting code that baffles the boys