Also called “habit spasms,” tics are involuntary, compulsive, rapid, repetitive movements like blinking and shoulder shrugging or vocalizations that include grunts, barks, and other utterances. Their expression may be somewhat controlled, but much like an itch that must be scratched, sufferers ultimately feel impelled to go through with them. Stress has been known to exacerbate tics. What symptom of Tourette syndrome, one type of tic disorder, has been highly publicized but is relatively rare? Discuss
Source: The Free Dictionary