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First, to test retrograde amnesia, rats received four sample\u2010exposure sessions within a day at 4 weeks and 1 day before the surgery, respectively. In the test sessions conducted 1 week after the surgery, both lesion groups showed a temporally ungraded retrograde amnesia. Second, to test anterograde amnesia, 1\u2010 and 4\u2010week retention intervals were inserted between the four sample\u2010exposure sessions and the test session. The RS\u2010lesioned rats showed a retention interval\u2010dependent impairment in the test sessions, while the HPC\u2010lesioned rats showed an impairment regardless of the retention interval. Finally, to test short\u2010term recognition memory, 5\u2010 or 30\u2010min delay was interposed between the single sample\u2010exposure session and the test session. Both lesion groups performed normally irrespective of the delay length. These results suggest that both the RS and HPC are important for long\u2010term object recognition memory, but these areas have different roles in it. \u00a9 2012 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/hipo.22021","type":"journal-article","created":{"date-parts":[[2012,4,3]],"date-time":"2012-04-03T13:14:59Z","timestamp":1333458899000},"page":"1868-1875","source":"Crossref","is-referenced-by-count":17,"title":["Dissociable anterograde amnesic effects of retrosplenial cortex and hippocampal lesions on spontaneous object recognition memory in 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