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Impairments on this task are known to manifest with advancing age. Interestingly, disrupting hippocampal activity leads to mnemonic discrimination impairments when lures are novel, but not when they are familiar. This observation suggests that other brain structures support discrimination abilities as stimuli are learned. The prefrontal cortex (PFC) is critical for retrieval of remote events and executive functions, such as working memory, and is also particularly vulnerable to dysfunction in aging. Importantly, the medial PFC is reciprocally connected to the perirhinal cortex and neuron firing in this region coordinates communication between lateral entorhinal and perirhinal cortices to presumably modulate hippocampal activity. This anatomical organization and function of the medial PFC suggests that it contributes to mnemonic discrimination; however, this notion has not been empirically tested. In the current study, rats were trained on a LEGO object\u2010based mnemonic similarity task adapted for rodents, and surgically implanted with guide cannulae targeting prelimbic and infralimbic regions of the medial PFC. Prior to mnemonic discrimination tests, rats received PFC infusions of the GABA\n                    <jats:sub>A<\/jats:sub>\n                    agonist muscimol. Analyses of expression of the neuronal activity\u2010dependent immediate\u2010early gene\n                    <jats:italic>Arc<\/jats:italic>\n                    in medial PFC and adjacent cortical regions confirmed muscimol infusions led to neuronal inactivation in the infralimbic and prelimbic cortices. Moreover, muscimol infusions in PFC impaired mnemonic discrimination performance relative to the vehicle control across all testing blocks when lures shared 50\u201390% feature overlap with the target. Thus, in contrast hippocampal infusions, PFC inactivation impaired target\u2010lure discrimination regardless of the novelty or familiarity of the lures. These findings indicate the PFC plays a critical role in mnemonic similarity task performance, but the time course of PFC involvement is dissociable from that of the hippocampus.\n                  <\/jats:p>","DOI":"10.1002\/hipo.23316","type":"journal-article","created":{"date-parts":[[2021,2,20]],"date-time":"2021-02-20T20:40:54Z","timestamp":1613853654000},"page":"701-716","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Rodent mnemonic similarity task performance requires the prefrontal cortex"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3392-0535","authenticated-orcid":false,"given":"Sarah A.","family":"Johnson","sequence":"first","affiliation":[{"name":"Evelyn F. and William L. 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