Fifty-year-old Carl suffers from a tremor, rigidity, and loss of vocal power. He looks expressionless, as if he were wearing a mask. These symptoms are consistent with a diagnosis of

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The symptoms described (tremor, rigidity, loss of vocal power, and expressionless face) are all characteristic of Parkinson's disease. Pick's disease is associated with personality changes and language impairments, Alzheimer's disease primarily affects memory and thinking skills, and Huntington's disease is characterized by involuntary movements and progressive cognitive decline.

Fifty-Year-Old Carl Suffers from a Tremor, Rigidity, and Loss of Vocal