Abnormally persistent latent inhibition induced by MK801 is reversed by risperidone and by positive modulators of NMDA receptor function: differential efficacy depending on the stage of the task at which they are administered

Abstract Rationale  Latent inhibition (LI) is the poorer conditioning to a stimulus resulting from its nonreinforced preexposure. LI indexes the ability to ignore irrelevant stimuli and is used extensively to model atten