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 ________ schizophrenia.

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Mrs. Petrides is displaying symptoms of catatonic schizophrenia, which is characterized by immobility or excessive motor activity, such as repetitive motions without purpose. The other types of schizophrenia (paranoid, undifferentiated, and residual) do not typically include these types of motor symptoms.