The eyebrow flash is an unconscious social signal, wherein a person, wishing to approach another whom they recognize and are preparing for social contact, raises their eyebrows for approximately one-fifth of a second. People generally return an eyebrow flash, unless it was given by someone whom they do not know, or someone who looks away immediately after. The message must be interpreted in context. Psychologists and sociologists say that eyebrow raising can be a reaction to fear or surprise.
- Crystal, David (2005). How Language Works. One Overlook Drive, Woodstock, NY 12498: The Overlook Press. p. 7. ISBN 1-58567-848-1.
- "SIRC guide to flirting". Retrieved 3 December 2010.
- Hinde, Robert (1975). Non-verbal communication. Cambridge University Press. p. 300. ISBN 0-521-29012-0. Retrieved 12/3/2010. Check date values in:
- Kelleher, Kathleen (19 August 1996). "In the World of Psychology, the Eyebrows Surely Have It". Los Angeles Times. Retrieved 17 December 2011.
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