EEG power changes reflect distinct mechanisms during long-term memory retrieval

Psychophysiology
Patrick Khader, Frank Rösler

Abstract

The roles of theta and alpha oscillations for long-term memory (LTM) retrieval are still under debate. Both are modulated by LTM retrieval demands, but it is unclear what specific LTM functions they are related to. Here, different oscillatory correlates of LTM retrieval could be obtained for theta and alpha with a paradigm that is suited to monitor the activation of a varying number of material-specific LTM representations. Both frequency bands responded parametrically to the number of retrieved items. However, only the alpha effect dissociated topographically for material type, indicating that the activation of material-specific representations became systematically modulated. For theta, this effect was material-unspecific with mid-frontal topography. These results suggest that alpha is functionally related to the activation of stored information, whereas theta is a sign of retrieval-related control processes.

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Citations

Nov 19, 2013·Journal of Cognitive Neuroscience·Catarina S FerreiraSimon Hanslmayr
Jan 15, 2016·Trends in Neurosciences·Simon HanslmayrHoward Bowman
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Sep 28, 2021·Psychophysiology·Sarah E HendersonKaren L Campbell

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