Forward and backward neural dynamics in cued recall
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The formation and use of associations across stimuli, time, and context are important organizing characteristics of episodic memory encoding and retrieval. Here, we investigate how the retrieval search proceeds in a forward versus backward manner, with a specific goal of further understanding the neural correlates of such processing. We take the first step toward this goal by having subjects complete a cued recall experiment, with scalp EEG acquired during the entire session. The cued recall phase was designed to force subjects to move in each direction at different times, thus providing distinctive neural activity that could be used to train a classifier using a multivariate pattern analysis (MVPA) approach. The classifier was then tested to identify forward/backward transitions on a moment-by-moment basis. The current study thus provides novel evidence of the neural correlates of time-based memory search, and the findings are discussed in relation to influential models of episodic retrieval.
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M.A.