Which of the following is NOT a characteristic symptom of a posterior inferior cerebellar infarct?

In the context of a posterior inferior cerebellar artery (PICA) infarct, the symptom of sleep disturbances is not typically associated with this condition, making it the correct answer to the question. PICA infarcts often result in specific neurological deficits due to their impact on the cerebellum and the brainstem, particularly affecting coordination and balance.

The hallmark symptoms of a PICA infarct include nystagmus, which is the involuntary movement of the eyes, and ataxia, which refers to impaired coordination and balance. Double vision may also occur due to cranial nerve involvement, specifically affecting the function of nerves that control eye movement. Each of these symptoms aligns with the regions of the brain affected by a PICA stroke. In contrast, sleep disturbances are more generalized and not a direct consequence of damage from a PICA infarction, focusing instead on other neurological or psychological factors that may not be present as a direct result of this particular type of stroke.