[Contingent negative deviation in children with headaches].

Contingent negative deviation (CND) was studied in 26 children with migraine and in 20--with headache, tension-type, aged 7-14 years. A control group included 16 healthy subjects. The study was conducted during pain-free intervals, with a 3 s interval between the warning stimulus--S1 and the imperative one--S2. Children with migraine had a higher negative wave amplitude than those with headache, tension type, and controls. Patients suffering from headache had a characteristic postimperative negative wave in the postimpulse period. CND may be considered as an additional index of migraine diagnosis in childhood.