A harmless form of epilepsy that occurs during infancy. Episodes of multiple seizures tend to occur over a day or few days. Psychomotor development is not affected. The seizures tend to involve increased muscle tone, apnea, cyanosis, eye deviation and psychomotor arrest. Type 1 differs from type 2 in the origin of the genetic defect (chromosome 19). See also Benign familial infantile seizures 1