Mark was diagnosed with schizophrenia many years ago. Most recently, he has been exhibiting some bizarre behaviors. For example, he has been standing for hours in unusual postures. Mark's motor dysfunction is called

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Catatonic immobility refers to the motor dysfunction in which an individual has minimal or no movement and may hold unusual postures for extended periods. This is a common symptom of schizophrenia, particularly the catatonic subtype. Cognitive slippage, inappropriate affect, and hebephrenia are other symptoms of schizophrenia, but they do not relate specifically to Mark's motor dysfunction in this scenario.

Mark Was Diagnosed with Schizophrenia Many Years Ago