Tics

What is a tic?

A tic is an involuntary contraction of a muscle or a group of muscles, which can result in a movement or a sound. Sometimes tics are classified as involuntary rather than involuntary – this is because peo

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Tics

What is a tic?

A tic is an involuntary contraction of a muscle or a group of muscles, which can result in a movement or a sound. Sometimes tics are classified as involuntary rather than involuntary – this is because peo

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