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  The phase of Theta oscillations modulates successful memory formation at encoding

Cruzat, J., Torralba, M., Ruzzoli, M., Fernández, A., Deco, G., & Soto-Faraco, S. (2021). The phase of Theta oscillations modulates successful memory formation at encoding. Neuropsychologia, 154: 107775. doi:10.1016/j.neuropsychologia.2021.107775.

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 Creators:
Cruzat, Josephine1, Author
Torralba, Mireia1, Author
Ruzzoli, Manuela2, Author
Fernández, Alba1, Author
Deco, Gustavo1, 3, 4, 5, Author              
Soto-Faraco, Salvador1, 3, Author
Affiliations:
1Computational Neuroscience Group, Department of Information and Communication Technologies, Center for Brain and Cognition, University Pompeu Fabra, Barcelona, Spain, ou_persistent22              
2Centre for Cognitive Neuroimaging, University of Glasgow, United Kingdom, ou_persistent22              
3Catalan Institution for Research and Advanced Studies (ICREA), University Pompeu Fabra, Barcelona, Spain, ou_persistent22              
4Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              
5School of Psychological Sciences, Monash University, Melbourne, Australia, ou_persistent22              

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Free keywords: Episodic memory; Ongoing oscillations; Phase resetting; Phase; Theta; Alpha
 Abstract: Several studies have shown that attention and perception can depend upon the phase of ongoing neural oscillations at stimulus onset. Here, we extend this idea to the memory domain. We tested the hypothesis that ongoing fluctuations in neural activity impact memory encoding in two experiments using a picture paired-associates task in order to gauge episodic memory performance. Experiment 1 was behavioural only and capitalized on the principle of phase resetting. We tested if subsequent memory performance fluctuates rhythmically, time-locked to a resetting cue presented before the to-be-remembered pairs at different time intervals. We found an indication that behavioural performance was periodically and selectively modulated at Theta frequency (~4 Hz). In Experiment 2, we focused on pre-stimulus ongoing activity using scalp EEG while participants performed a paired-associates task. The pre-registered analysis, using large electrode clusters and generic Theta and Alpha spectral ranges, returned null results of the pre-stimulus phase-behaviour correlation. However, as expected from prior literature, we found that variations in stimulus-related Theta-power predicted subsequent memory performance. Therefore, we used this post-stimulus effect in Theta power to guide a post-hoc pre-stimulus phase analysis in terms of scalp and frequency of interest. This analysis returned a correlation between the pre-stimulus Theta phase and subsequent memory. Altogether, these results suggest that pre-stimulus Theta activity at encoding may impact later memory performance.

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Language(s): eng - English
 Dates: 2021-01-072020-02-272021-02-032021-02-132021-04-16
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.neuropsychologia.2021.107775
Other: Epub 2021
PMID: 33592222
 Degree: -

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Title: Neuropsychologia
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 154 Sequence Number: 107775 Start / End Page: - Identifier: ISSN: 0028-3932
CoNE: https://pure.mpg.de/cone/journals/resource/954925428258