A 4-year-old boy is brought to the pediatric neurology clinic with a history of recurrent nocturnal seizures characterized by prominent vomiting, pallor, and miosis lasting 45 minutes. Brain MRI is normal. The interictal EEG shows the pattern marked **A** in the diagram — high-amplitude occipital spikes that attenuate when the child opens his eyes during the recording. Which of the following best describes the pathophysiological significance of this fixation-off sensitivity in this clinical context?
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