Disability descriptors - The Open University
Tics are often preceded by a feeling of inner tension. They may be transient or chronic. Simple tics. Simple motor tics involve isolated movements, e. g., blinking, twitching of abdominal muscles, or shrugging of the shoulders. Simple vocal tics may involve moaning, grunting, hissing, clicking, shouting, throat clearing, sniffing, or coughing. ... ................
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