The following section addresses the question of whether the set of neurotransmitters and/or molecularly-defined neurotransmitter receptor subtypes necessary for various forms of action inhibition and waiting are similar or distinct. As noted above, one key argument in favor of the delineation of these forms of impulsivity from one another has been their differential sensitivity to pharmacological manipulation of monoaminergic systems.2, 55, 116 The following section will focus on monoamine systems, at the expense of discussing other relevant systems like glutamate, GABA, acetylcholine, cannabinoids, etc., because the majority of research in the field has focused on monoamine systems, allowing for a more comprehensive, comparative analysis of different forms of inhibitory response control. The pattern of results discussed below are graphically displayed in Table 2.
