Cognitive impairment in cervical dystonia: core clinical feature or secondary effect related to non-motor symptoms?

The study explores cognitive impairment in cervical dystonia in relation to motor severity and non-motor domains, with the multivariable model suggesting a potential role of sleep disturbances. The findings do not allow a definitive distinction between cognitive impairment as a core feature of dystonia or a secondary effect related to non-motor symptoms, but they indicate complex and interdependent mechanisms.