Source memory was more vulnerable than spatial memory to impairment in rats.
NMDAR antagonist MK-801 preferentially impaired source memory over spatial memory.
PSD95-nNOS inhibitors failed to produce spatial memory or source memory impairments.
IC87201 and ZL006 disrupt NMDA-stimulated formation of nitric oxide in vitro.
PSD95-nNOS disruptors may lack unwanted side effects of NMDAR antagonists.