A 9-month-old boy presents with a first prolonged focal motor seizure (right arm and right face clonic jerking, 35 minutes duration) requiring IV lorazepam and phenytoin. On examination, there is a large port-wine stain on the left forehead, upper eyelid, and cheek in the V1 distribution, present since birth. MRI shows leptomeningeal angiomatosis over the left parieto-occipital cortex with cortical atrophy and gyriform calcifications. The EEG demonstrates the finding marked **A** in the diagram. Which of the following best explains the pathophysiological basis of this EEG abnormality in Sturge-Weber syndrome?
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