ABSTRACT
The underarousal theory [9] asserts that children with ADHD are underaroused and seek excessive outside stimulation. A stimulant, therefore, would correct this problem. The overarousal theory posits the presence of excessive neurotransmitters, such as norepinephrine, which stimulants correct by downregulation of the receptor [10]. Tests of arousal, however, such as skin conductance, cortical evoked potentials, and electroencephalography (EEG), have not shown consistent differences between normal children and those with ADHD nor have studies shown differences in peripheral measures of neurotransmitters.
