Final answer:
The involuntary movement of a small group of muscles, characteristic of Tourette syndrome, is referred to as tics. Therefore, the correct option is C.
Step-by-step explanation:
Tics, or involuntary, repetitive movements or vocalisations, are a defining characteristic of Tourette syndrome. When these tics affect the face, they can appear as eye blinking, grimacing, or other repetitive facial movements. These tics can affect different muscle groups.
Different from other movement disorders are tics. Hemiparesis is the weakening on one side of the body, Myoclonus is abrupt, transient muscular contractions, and Dystonia is prolonged muscle contractions resulting in aberrant postures.
For the purpose of diagnosing and treating Tourette syndrome, a neurodevelopmental illness marked by the presence of both motor and vocal tics, it is essential to recognise and comprehend the nature of tics.
Therefore, the correct option is C.