The Entorhinal Cortex–Nucleus Accumbens Pathway and Latent Inhibition: A Behavioral and Neurochemical Study in Rats

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Latent inhibition (LI) refers to the decrease in conditioned response produced by the repeated nonreinforced preexposure to the to-be-conditioned stimulus. Experiment 1 investigated the effects of electrolytic lesions of the entorhinal cortex on LI in a conditioned emotional response procedure. Entorhinal cortex lesions attenuated LI. Experiments 2 and 3 investigated whether this attenuation of LI could result from a modification in nucleus accumbens (NAcc) dopamine (DA) release. Rats with entorhinal cortex lesions displayed normal spontaneous and amphetamine-induced locomotor activity, as well as normal basal and amphetamine-induced release of DA within the NAcc (assessed by microdialysis). Taken together, these results show that entorhinal cortex lesions disrupt LI in a way that is unlikely to be due to an alteration of DA release within the NAcc.

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