Daily fluctuations of negative affect are only weakly associated with tremor symptoms in functional and organic tremor patients

•Psychological factors are thought to play a role in functional movement disorders.•We compared the influence of negative affect in functional (FT) and organic tremor (OT).•Contemporaneous associations between negative affect and tremor symptoms were weak.•Time-lagged associations were mixed and only present in a subset of patients.•These associations were mainly similar between patients with FT or OT.