A 25-year-old male is being evaluated. Rhythmic jerk nystagmus is elicited by having the patient look at a rotating drum with stripes on it. This finding suggests which of the following?

a. Drug toxicity

b. Brainstem ischemia

c. Parinaud syndrome

d. Unilateral parietal lobe damage

e. No pathologic lesion in the brain

the answer is below…

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