GRM4 and schizophrenia: Lastly, the notion that mGlu receptor ligands would provide a powerful cognition-enhancing approach to mitigate the deficits observed in schizophrenia is further evidenced by the mGlu2 PAM SAR218645 improving learning and memory in rodent models of schizophrenia as well as the preclinical cognition-enhancement observed with mGlu4 agonists and PAMs.