Tic
Sudden movement or vocalization / From Wikipedia, the free encyclopedia
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A tic is a sudden and repetitive motor movement or vocalization that is not rhythmic and involves discrete muscle groups.[1][2][3] It is typically brief, and may resemble a normal behavioral characteristic or gesture.[4]
Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing.[5]
Tics must be distinguished from movements of disorders such as chorea, dystonia and myoclonus; the compulsions of obsessive–compulsive disorder (OCD) and seizure activity;[6] and movements exhibited in stereotypic movement disorder or among autistic people (also known as stimming).[7][8][9]