• Carolien E J Heintz, Mirjam J van Tricht, Sandra M A van der Salm, A F van Rootselaar, Danielle Cath, Ben Schmand, and Marina A J Tijssen.
• Department of Neurology, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands.
• J. Neurol. Neurosurg. Psychiatr.. 2013 Aug 1;84(8):862-7.

BackgroundPsychogenic movement disorders are disorders of movements that cannot be explained by a known neurological disorder and are assumed to be associated with psychiatric symptoms such as depression and anxiety.ObjectiveTo examine the neuropsychological profile of patients with psychogenic movement disorders.MethodsWe examined cognitive functioning using neuropsychological tests in 26 patients with clinically established psychogenic jerky movement disorders (PMD). We included 16 patients with Gilles de la Tourette syndrome (GTS) who served as a patient control group, in addition to 22 healthy control subjects. Non-credible test performance was detected using a Symptom Validity Test (SVT). Psychopathology was also assessed.ResultsApart from a worse performance on a verbal memory task, no evidence of neuropsychological impairments was found in our PMD sample. Interestingly however, patients with PMD reported more cognitive complaints in daily life and performed worse on the SVT than the two other groups. Patients with GTS did not report, or show, cognitive impairments. In patients with PMD, we found associations between verbal learning, SVT performance and severity of depression and anxiety complaints.ConclusionsWe conclude that some patients with PMD show non-credible cognitive symptoms. In contrast, no evident cognitive impairments were present in patients with PMD or GTS. Our study underlines the importance of assessment of non-credible response in patients with PMD. Additionally, non-credible response might aid in the differentiation of PMD from other movement disorders.

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