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A head shake is a gesture in which the head is turned left and right along the transverse plane repeatedly in quick succession. In many cultures, it is most commonly, but not universally, used to indicate disagreement, denial, or rejection. It can also signify disapproval or upset at a situation, often with slower movement. Head shaking while trying food, in Western cultures, can also communicate one is enjoying the food or a strong approval of it.
To indicate rejection
Different cultures assign different meanings to the gesture. Shaking to indicate "no" is widespread, and appears in a large number of diverse cultural and linguistic groups. Areas in which head shaking generally takes this meaning include the Indian subcontinent, the Middle East, Africa, Southeast Asia, Europe, South America, North America and Australia.
To indicate approval
However, in some Southeastern European areas such as Greece and southern Albania, it is used for the opposite purpose, to indicate affirmation, meaning "yes". In those regions, nodding in fact means "no" as well, the complete reverse of most other places in the world.
There are varying theories as to why head shake is so frequently used to mean "no". One simple theory is that it is most common form of expressing negative reaction, indicating that one disagrees with the other person. It has also been stated that babies, when hungry, search for their mother's milk by moving their heads vertically, but decline milk by turning their head from side to side.
An early survey of head shake and other gestures was The Expression of the Emotions in Man and Animals, written by Charles Darwin in 1872. Darwin wrote to missionaries in many parts of the world asking for information on local gestures, and concluded that shaking head for "no" was common to many different groups.
This gesture can be classified into two types based on the speed of delivery:
- Fast: If the listener is shaking his or her head in quick succession, it implies that he or she disagrees with the speaker and wants to take the speaker's role.
- Slow: A slow head shake implies that the listener does not agree with the speaker's message but does not want to interrupt the speaker.
- Darwin, Charles. The Expression of the Emotions in Man and Animals. New York: D. Appleton and Company, 1913; Page 272, accessed through Google Book Search.
- Kuhnke, Elizabeth. Body Language For Dummies. Page 49, accessed through Google Book Search
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