Brain monoamines and early visual information-processing speed

Abstract

Visual inspection time (IT) is a measure of information-processing speed, which correlates reliably with psychometric intelligence. Pharmacological research into IT indicates that manipulation of the cholinergic system modulates performance on the IT task, however the contribution of other neurotransmitters to this modality remains unclear. This study was designed to examine the effects of low brain serotonin and catecholamine availability on IT using the established method of amino-acid precursor depletion. Female participants (n=13) completed three experimental sessions; tryptophan depletion (TD); tyrosine/ phenylalanine depletion (TPD); and a balanced control condition (B) in a randomized..