Although Mrs.Petrides usually sits passively in a motionless stupor,she sometimes repetitiously shakes her head or waves her arms.She most likely suffers from

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Mrs.Petrides' behavior of sitting passively in a motionless stupor and sometimes repetitiously shaking her head or waving her arms is characteristic of catatonia, which is a symptom of several mental disorders including schizophrenia, bipolar disorder, and depression.