that neuroamino acids exert direct effects ( not mediated via their amine metabolites ) is illustrated by the rapid effects of microiontophoretic dopa upon cortical unit activity , and by the observation that neither the lethargic effect of 5-hydroxytryptophan ( considered to support jouvet 's serotonergic theory of sleep ) nor the behavioral stimulant effects of dopa ( considered to support the catecholamine theory of affective behavior ) are significantly prevented by l-aromatic amino acid decarboxylase inhibitors .
C0013023
dopa
C0007412
catecholamine