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- W30915082 abstract "The efficient use of episodic memory does not only require to remember new information, it also requires to forget old information. That such memory updating is part of our memory system is suggested by behavioral studies examining both contextual and intentional memory updating. The electrophysiological correlates of episodic memory updating, however, still remain elusive. To investigate episodic memory updating, the context-change paradigm and the directed-forgetting paradigm can be used. In the directed-forgetting paradigm, subjects are cued to intentionally forget a previously learned item list and to learn a new list of items instead. In the context-change paradigm, subjects are cued to change their internal context between the learning of two lists. Both forms of cuing typically lead to forgetting of the first list and to memory enhancement of the second. The standard explanation of these effects is that forgetting and enhancement are mediated by a single mechanism: context differentiation in contextual memory updating and retrieval inhibition in intentional memory updating. In four experiments the necessity of new learning after cue presentation and the electrophysiological (EEG) correlates of forgetting and enhancement as they occur in these paradigms were explored. In both paradigms, forgetting of the first list was only observed when a second list was learned after cuing. Analysis of oscillatory EEG activity revealed that the forgetting in contextual memory updating was accompanied by an increase of theta phase coupling between scalp electrodes which is suggested to reflect the establishment of a new mental List-2 context. On the other hand, the forgetting in intentional memory updating was accompanied by a decrease of upper alpha phase coupling which is suggested to reflect an inhibitory disintegration of the to-be-forgotten information. Thus, phase coupling mediated the forgetting both in contextual and intentional memory updating, but in different frequency bands. In both paradigms, memory enhancement was accompanied by an increase in upper alpha band power which is suggested to reflect a change of encoding strategy after cuing. In sum, the present experiments revealed separate neural origins of forgetting and memory enhancement and thus point to a two-mechanism view of episodic memory updating." @default.
- W30915082 created "2016-06-24" @default.
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- W30915082 date "2008-01-20" @default.
- W30915082 modified "2023-09-27" @default.
- W30915082 title "Updating processes in episodic memory" @default.
- W30915082 hasPublicationYear "2008" @default.
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