darkans

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[..]The fact that ~10% of neurons in the brain fire at any one time is a possible source of this misconception. (If a large percentage of the neurons were to fire at the same time, the result would be a Grand mal seizure.)[..]

Tonic-clonic seizures (Older term: grand mal):
[..]Tonic-clonic seizures involve an initial contraction of the muscles (tonic phase) which may involve tongue biting, urinary incontinence and the absence of breathing. This is followed by rhythmic muscle contractions (clonic phase).[..]