Just adding more for your information:
Quote:
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Stereotypies are repetitive, stereotyped, purposeless movements that may be made by normal children when they are bored, excited, or engrossed in an activity. Stereotypies are often associated with attention deficit disorder (ADD), developmental delay, or autism. They may consist of hand flapping, clapping, slapping, fluttering, rocking, or facial movements. These children are not necessarily aware that they are making the movements. In some cases, these movements can be voluntarily suppressed.
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that's from the second on Tics at WeMove
http://www.wemove.org/tics/tic.html