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It lasted only seconds but the EEG showed the presence of a type of generalized seizure called an “absence seizure” — characterized by a lack of attention.

During an absence seizure, those affected have a sudden loss of consciousness for a short period of time.

The thalamus is involved in wakefulness and awareness, and the hallmark symptom of the absence seizure is a loss of consciousness.

This is known as an absence seizure, and over the next year William, now 10, who lives with his family in Brooklyn, went from having one or two a day to suffering constant seizures.