A tic is a sudden, repetitive, nonrhythmic, stereotyped motor movement or vocalization involving discrete muscle groups. 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. Movements of other movement disorders (for example, chorea, dystonia, myoclonus) must be distinguished from tics. Other conditions, such as autism and stereotypic movement disorder, also include movements which may be confused with tics. Tics must also be distinguished from the compulsions of OCD and from seizure activity.Read more on Wikipedia
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