\cite{Fremer2024} published another study focused on differences between patients with tics and FTLB. 32 patients with FTLB were compared with very large sample of patients with tics (n=1032). A number of previously listed characteristic of FTLB group were replicated: older age of onset, higher prevalence of females, higher rate of obsene and socially inappropriate behaviors. Interestingly, FTLB patients had significantly lower rates of typical psychiatric comorbidities that occur in TS (ADHD and OCD).
 As noted above, patients with TS are not immune from also developing functional tic-like behaviors (FTLB). This association is not surprising, as for example pseudoseizures are more common in people with epilepsy. \citet{M_ller_Vahl_2023} present data on 71 TS patients whom they also diagnosed with FTLB. A majority (56%-79%) had psychological features common in people with other functional symptoms, and about a third of them had a history of other medically unexplained symptoms; these findings suggest that the cause of FTLBs is likely similar to that of other functional neurological symptoms. The authors comment that their ability to identify a fairly large sample of TS+FTLB suggests that clinicians faced with treatment-resistant symptoms in TS should consider whether the symptoms are FTLB rather than tics.
Diagnostic agreement in assessing FTLB was examined by asking eight experts in diagnosing and treating patients with tics to evaluate videos from 24 adults and diagnose them with either functional tics, primary tics or both \citep{Rigas2023}. The diagnostic agreement was fair based on phenomenology alone, and increased to moderate when additional clinical information was provided. The diagnostic distinction between primary and functional tics is shown to be difficult in the absence of clinical information.