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It is well known that formation of new episodic memories depends on hippocampus,but in real-life settings (e.g., conversation), hippocampal amnesics can utilizeinformation from several minutes earlier. What neural systems outsidehippocampus might support this minutes-long retention? In this study, subjectsviewed an audiovisual movie continuously for 25 min; another group viewed themovie in 2 parts separated by a 1-day delay. Understanding Part 2 depended onretrieving information from Part 1, and thus hippocampus was required in theday-delay condition. But is hippocampus equally recruited to access the sameinformation from minutes earlier? We show that accessing memories from a fewminutes prior elicited less interaction between hippocampus and default modenetwork (DMN) cortical regions than accessing day-old memories of identicalevents, suggesting that recent information was available with less reliance onhippocampal retrieval. Moreover, the 2 groups evinced reliable but distinct DMNactivity timecourses, reflecting differences in information carried in theseregions when Part 1 was recent versus distant. The timecourses converged after 4min, suggesting a time frame over which the continuous-viewing group may haverelied less on hippocampal retrieval. We propose that cortical default moderegions can intrinsically retain real-life episodic information for severalminutes.

Accessing Real-Life Episodic Information from Minutes versus Hours Earlier Modulates Hippocampal and High-Order Cortical Dynamics