Tic assessment 
Phenomenology

 Video-recordings of 156 patients with TS were assessed for tic duration \cite{Baizabal-Carvallo2022}. Dystonic tics were longer lasting than tonic tics. Furthermore, patients with dystonic tics has older age of onset, older age at evaluation, greater tic severity, more complex tics, and increased risk for being considered for deep brain stimuation than patients with tonic tics.