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Medial Temporal Theta/Alpha Power Enhancement Precedes Successful Memory Encoding: Evidence Based on Intracranial EEG
Open accessAbstract
Not only poststimulus, but also prestimulus neural activity has been shown to be predictive for later successful memory encoding. However, it is still not clear which medial temporal lobe processes precede effective memory formation. Here, our aim was to investigate whether such prestimulus markers for successful memory encoding can be specified based on intracranial recordings directly from the hippocampus and rhinal cortex. For this purpose, we analyzed subsequent memory effects during a continuous word recognition paradigm in 31 presurgical epilepsy patients. We found that rhinal and hippocampal theta and successive alpha power enhancement before word presentation predicted successful memory encoding. Previous studies suggest that stimulus-triggered hippocampal theta activity is particularly related to memory retrieval and activation of a mnemonic context, whereas the alpha rhythm reflects inhibitory top-down control of task processing and executive functioning. In line with these suggestions, we propose that the observed medial temporal theta and alpha power increases before stimulus presentation reflect activation of contextual information and inhibitory top-down control processes preparing for stimulus-triggered memory processing.
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“Theta activity in waking is considered a condition favoring the encoding of new information and associated synaptic plastic processes in hippocampal networks (64,371,612,1251).”
From About Sleep's Role in Memory (2013) · cites this paper as [371]
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“(1) the amount of theta power present at the time individuals are asked to recall a stimulus is associated with the recall of that stimulus (Fell et al., 2011; Guderian, Schott, Richardson-Klavehn, & Duzel, 2009; Lega, Jacobs, & Kahana, 2012; Watrous et al., 2013)”
From Brain oscillations, hypnosis, and hypnotizability (2015) · cites this paper as Fell et al., 2011
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Metadata
- Authors
- Fell, J., Ludowig, E., Staresina, B. P., Wagner, T., Kranz, T., Elger, C. E., & Axmacher, N.
- Affiliations
- University of Bonn (DE)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2011-04-06
- Volume
- 31
- Issue
- 14
- Pages
- 5392-5397
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6622710
- OpenAlex
- W2025180344
- Cited by
- 203
- References
- 44
- Citations by year
- 2026: 5 · 2025: 11 · 2024: 9 · 2023: 13 · 2022: 18 · 2021: 19 · 2020: 16 · 2019: 9 · 2018: 17 · 2017: 13 · 2016: 14 · 2015: 11 · 2014: 17 · 2013: 18 · 2012: 9
- FWCI
- 7.64
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Deutsche Forschungsgemeinschaft
- Volkswagen Foundation (I/79878)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- memory encoding, medial temporal lobe, hippocampus, rhinal cortex, theta power, alpha power, subsequent memory effect, word recognition, top-down control, contextual information, epilepsy patients, intracranial EEG
- MeSH terms
- Adolescent, Adult, Alpha Rhythm, Brain Mapping, Child, Child, Preschool, Electroencephalography, Epilepsy, Temporal Lobe, Female, Hippocampus, Humans, Male, Middle Aged, Neuropsychological Tests, Photic Stimulation, Reaction Time, Temporal Lobe, Theta Rhythm, Vocabulary, Statistics, Nonparametric, Recognition, Psychology, Young Adult
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