Benign Rolandic Epilepsy

A 9-year-old boy with normal development and cognition is referred for EEG after two nocturnal seizures with oropharyngeal symptoms and secondary generalization. Neuroimaging is normal. During sleep-deprived EEG, the recording shows frequent high-amplitude diphasic sharp waves with maximum negativity at centrotemporal electrodes (C3/C4, T3/T4), demonstrating a characteristic horizontal dipole pattern. These discharges are unilateral but shift between hemispheres and are dramatically potentiated during sleep. The structure marked **A** in the diagram represents the characteristic EEG finding in this clinical context. Which of the following best describes the relationship between this EEG pattern and the clinical presentation?