Temporal pattern similarity in human MEG and intracranial EEG reveals the reinstatement of episodic memory trajectories
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1
University of Konstanz, Department of Psychology, Germany
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2
University of Munich, Department of Neurology, Germany
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3
University of Birmingham, School of Psychology, United Kingdom
Episodic memory allows us to re-experience past episodes. Thereby, retrieving episodes from memory involves the reinstatement of context rich temporal trajectories, rather than static events. While previous studies associated memory reactivation with the reinstatement of spatial patterns of brain activity, it remains unclear whether endogenous temporal neural trajectories are reactivated during memory retrieval. Introducing a novel approach, we assessed the re-activation of temporal trajectories by analyzing the temporal similarity of electrophysiological patterns between encoding and retrieval. We used non-static movie stimuli as contexts and manipulated the overlap between encoding and retrieval, allowing us to link the temporal trajectories to context memory, which is the crucial feature of episodic memory. We recorded MEG from 18 healthy subjects and intracranial EEG from 2 epileptic patients participating in the context memory paradigm. Behaviorally, a significant context-memory effect was found. Analyzing the temporal pattern similarity between encoding and retrieval, we found that temporal patterns in the theta phase of the visual processing pathway tracked the repetition of single items. More importantly, memory reinstatement was found to be reflected in the similarity of temporal pattern in the beta phase of MEG and intracranial EEG and was modulated by the overlap of encoding and retrieval contexts. The present study demonstrates, for the first time, that temporal patterns in human brain activity track the encoding and reinstatement of episodic memory trajectories. The results corroborate the reinstatement hypothesis and underline the importance of temporal trajectories for human memory processes.
Keywords:
MEG,
intracranial EEG,
context-dependent memory,
Temporal trajectories,
Memory reinstatement,
eipsodic memory
Conference:
XII International Conference on Cognitive Neuroscience (ICON-XII), Brisbane, Queensland, Australia, 27 Jul - 31 Jul, 2014.
Presentation Type:
Poster
Topic:
Memory and Learning
Citation:
Staudigl
T,
Vollmar
C,
Noachtar
S and
Hanslmayr
S
(2015). Temporal pattern similarity in human MEG and intracranial EEG reveals the reinstatement of episodic memory trajectories.
Conference Abstract:
XII International Conference on Cognitive Neuroscience (ICON-XII).
doi: 10.3389/conf.fnhum.2015.217.00356
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Received:
19 Feb 2015;
Published Online:
24 Apr 2015.
*
Correspondence:
Dr. Tobias Staudigl, University of Konstanz, Department of Psychology, Konstanz, Germany, tobias.stdgl@gmail.com
Dr. Simon Hanslmayr, University of Birmingham, School of Psychology, Birmingham, United Kingdom, s.hanslmayr@bham.ac.uk