[Adrenaline and noradrenaline levels in 10-12-year-old boys during a mathematics test]

Blood plasma adrenaline and noradrenaline levels were measured using radio-enzyme techniques in 53 normally intelligent boys aged 10 to 12 years with and without Attention Deficit Disorders. The measurements were performed while the subjects were at rest and during a calculation load test. An anticipatory effect in the release of catecholamine and phasic phenomena were observed. Intelligence and mental lability are implicated in catecholamine release during load situations als well as genetic factors.