Review Question - QID 214789

A 68-year-old man is brought to his primary care physician by his daughter for “abnormal behavior” that has progressively worsened over the last year. His daughter says that the patient does not seem to understand what is being said to him by his daughter and wife. He seems to be more responsive to questions from his son. During family gatherings the patient isolates himself. Lately, the patient has been sitting much closer to the television and does not notice people around him unless they touch his shoulder. He is able to care for himself without assistance. He has a medical history of hypertension and hyperlipidemia and does not smoke or drink alcohol. He takes losartan and atorvastatin. His temperature is 98.6°F (37.0°C), blood pressure is 112/75 mmHg, pulse is 75/min, and respirations are 12/min. Neurological examination is notable for normal strength and sensation in the bilateral upper and lower extremities. Which of the following will most likely elucidate the diagnosis?