This presentation discusses two neural models of working memory (WM). It focuses on the subclass of models known as gating models. Gating models assume that only task-relevant information is robustly maintained in WM. Two such models will be presented and compared, each solving the AX continuous performance test, which involves WM processing. Evidence for the models is presented. The models agree that the prefrontal cortex is the seat of WM and that a gating mechanism controls what information is added to WM. They differ on the hypothesized neural substrate for the gating mechanism. One model proposes that dopamine mesocortical pathway is the substrate. The other proposes that the nigrostriatal pathway and the basal ganglia form the substrate.