A 58-year-old man with hypertension presents to the emergency department 36 hours after acute onset of left-sided weakness and aphasia. CT head shows a large right middle cerebral artery territory infarct. Continuous EEG monitoring is initiated due to altered mental status. The EEG reveals the pattern marked **B** in the diagram—stereotyped, repetitive sharp-wave complexes occurring at regular intervals of 1 Hz, confined to the right hemisphere. Which of the following best explains the pathophysiological basis for this EEG finding?
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