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  • Title: Psychogenic tics: diagnostic value of the placebo test.
    Author: Tan EK.
    Journal: J Child Neurol; 2004 Dec; 19(12):976-7. PubMed ID: 15704874.
    Abstract:
    Motor tics are characterized by abrupt onset of brief, unsustained focal movements that are usually preceded by a premonitory sensation and are suppressible. Psychogenic tics (pseudotics) are rarely described. It may not be easy to distinguish organic from functional tics because they can coexist. Using a case illustration, the value of a "staged" placebo test in aiding the diagnosis of psychogenic tics is described. In addition, a concise summary of the clinical phenomenology of tics and the diagnosis and management of psychogenic movement disorders is provided.
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