A tic is a sudden, rapid, repetitive movement (motor tic) or vocalization (vocal tic).
There are two main types of tics:
Simple tics involve one muscle group
Simple motor tics include head shaking, eye blinking, sniffing, neck jerking, shoulder shrugging and grimacing. These are more common.
Simple vocal tics include coughing, throat clearing and barking.
Complex tics involve more than one...
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Source: ADAM Encyclopedia
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