The tick-tick sound comes from the movement of gears and parts inside the clock. In mechanical clocks, a part called the ...

The familiar tick-tock of wall clocks originates from the escapement mechanism, which controls gear movement in precise steps. While our brains perceive two distinct sounds, clocks actually produce ...

Tic disorders are conditions featuring sudden, non-rhythmic movements or vocalizations. A formal tic disorder diagnosis is determined by tic frequency, duration, and type. Tics are non-rhythmic ...

Motor tics are spasmodic contractions of muscles, which typically involve the face and are habitual. Examples include squinting the eyes, grimacing, or even turning the head. Sometimes motor tics ...

Since the start of the COVID-19 pandemic, doctors have observed an increase in teen girls experiencing tics — or what appears to be verbal and motor tics. “Tics are sudden, repetitive, non-rhythmic ...

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