GRM1 and psychiatric disorder: Further studies are necessary to translate the functional relevance of ErbB-dependent regulation of mGluR1-mediated LTD in SNpc DA cells in the control of DA-related behaviors and learning/memory processes, as well as to unveil the potential involvement of NRG1/mGluR1 interplay in pathogenesis of neurological and psychiatric disorders associated to dysfunction of the midbrain DA system.