A mother brings her 18-month-old son to the clinic. She states that the child rarely talks or smiles or makes eye contact. She has also noticed that he does not like to be held. She says his motor development seems to be normal. These symptoms are consistent with what condition? a. Dementia b. Autistic disorder c. ADHD d. Delirium A patient with Alzheimer disease classically displays which of the following? a. Alternating level of orientation—good during the day but poor at night b. Hallucinations and decorticate posturing c. Disintegration of personality d. Rapid onset of symptoms

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