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Although the retrosplenial cortex (RSC) is necessary for the retrieval of remotely acquired fear to a discrete auditory cue, it is not necessary for the retrieval of recently acquired cued-fear memories. Thus, the RSC's role in memory retrieval for discrete cues is time-dependent. The purpose of the current experiment was to identify the larger cortical circuit involved in the retrieval of remotely-acquired auditory fear memories. One candidate circuit involves the RSC and secondary auditory cortex; the secondary auditory cortex is also necessary for the retrieval of remotely acquired auditory fear memories (Sacco & Sacchetti, 2010), and sends direct projections to the RSC. To test this possibility, we assessed retrieval of remote memory following functional disconnection of the RSC and secondary auditory cortex. Complete disconnection of these regions produced a larger impairment in fear expression to a remotely acquired auditory cue compared to partial disconnection of these regions. These results are consistent with the notion that RSC and secondary auditory cortex form a functional circuit involved in the retrieval of remotely acquired fear to a discrete auditory cue. (PsycINFO Database Record (c) 2018 APA, all rights reserved)





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