Why do some blind people twist their heads back and forth and rock?

blind Forth Heads people rock Twist
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Why do some blind people twist their heads back and forth and rock?

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Those mannerisms are called “blindisms.” They come from not being aware of one’s body in space when one cannot see. There is an interesting article about blindisms at this link: http://www.tsbvi.edu/Outreach/seehear/spring02/blindisms.