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• W2883076886 endingPage "7439" @default.
• W2883076886 startingPage "7428" @default.
• W2883076886 abstract "Increased memory load is often signified by enhanced neural oscillatory power in the alpha range (8-13 Hz), which is taken to reflect inhibition of task-irrelevant brain regions. The corresponding neural correlates of memory decay, however, are not yet well understood. In the current study, we investigated auditory short-term memory decay in humans using a delayed matching-to-sample task with pure-tone sequences. First, in a behavioral experiment, we modeled memory performance over six different delay-phase durations. Second, in a MEG experiment, we assessed alpha-power modulations over three different delay-phase durations. In both experiments, the temporal expectation for the to-be-remembered sound was manipulated so that it was either temporally expected or not. In both studies, memory performance declined over time, but this decline was weaker when the onset time of the to-be-remembered sound was expected. Similarly, patterns of alpha power in and alpha-tuned connectivity between sensory cortices changed parametrically with delay duration (i.e., decrease in occipitoparietal regions, increase in temporal regions). Temporal expectation not only counteracted alpha-power decline in heteromodal brain areas (i.e., supramarginal gyrus), but also had a beneficial effect on memory decay, counteracting memory performance decline. Correspondingly, temporal expectation also boosted alpha connectivity within attention networks known to play an active role during memory maintenance. The present data show how patterns of alpha power orchestrate short-term memory decay and encourage a more nuanced perspective on alpha power across brain space and time beyond its inhibitory role.SIGNIFICANCE STATEMENT Our sensory memories of the physical world fade quickly. We show here that this decay of short-term memory can be counteracted by so-called temporal expectation; that is, knowledge of when to expect a sensory event that an individual must remember. We also show that neural oscillations in the alpha (8-13 Hz) range index both the degree of memory decay (for brief sound patterns) and the respective memory benefit from temporal expectation. Spatially distributed cortical patterns of alpha power show opposing effects in auditory versus visual sensory cortices. Moreover, alpha-tuned connectivity changes within supramodal attention networks reflect the allocation of neural resources as short-term memory representations fade." @default.
• W2883076886 created "2018-08-03" @default.
• W2883076886 creator A5000324585 @default.
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• W2883076886 date "2018-07-16" @default.
• W2883076886 modified "2023-10-17" @default.
• W2883076886 title "Temporal Expectation Modulates the Cortical Dynamics of Short-Term Memory" @default.
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• W2883076886 doi "https://doi.org/10.1523/jneurosci.2928-17.2018" @default.
• W2883076886 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6596135" @default.
• W2883076886 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30012685" @default.
• W2883076886 hasPublicationYear "2018" @default.

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