ArticlePsychophysiology2024
The role of theta and gamma oscillations in item memory, source memory, and memory confidence.
Article in Psychophysiology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Target detection enhances relational processing of background items: evidence from associative recognition paradigms and EEG.BMC psychology · 2026Article
- Beyond Context-Transfer Effects: Attenuated Familiarity During Virtual Reality-Based Retrieval Across Different Encoding Modalities.The European journal of neuroscience · 2026Article
- Processing of different word list lengths during encoding and retrieval in Broca's area.Frontiers in human neuroscience · 2026Article
- Engrams Formed in Virtual Reality Exhibit Reduced Familiarity Upon Retrieval: Electrophysiological Correlates of Source Memory Retrieval Indicate Modality-Dependent Differences in Recognition Memory.The European journal of neuroscience · 2025Article
- Utilizing tACS to enhance memory confidence and EEG to predict individual differences in brain stimulation efficacy.Imaging neuroscience (Cambridge, Mass.) · 2025Article
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Abstract
Theta and gamma oscillations have been linked to episodic memory processes in various studies. Both oscillations seem to be vital for processes guided by the medial temporal lobe, such as the retrieval of information from memory. While theta oscillations increase with successful memory, it is unclear what the unique contribution of theta is to various subcomponents of memory. On the other hand, memory-related gamma oscillations have been mainly reported in the hippocampus, leaving the role of neocortical gamma in memory underexplored. In this study, we investigated how unique variability in memory accuracy and memory confidence contributes to fluctuations in theta and gamma power. To this end, we recorded EEG from 54 participants while they performed a source memory task. From this task we obtained their item memory accuracy, source memory accuracy, item memory confidence, and source memory confidence. These behavioral measures were put in a trial-by-trial linear mixed effects model to uncover their unique contribution to the oscillatory power in frontal and parietal regions. Our results are in line with the involvement of theta oscillations in both memory accuracy and confidence, but seem to indicate a main role for theta oscillations in memory-related confidence. In addition, we found that gamma oscillations play various roles in memory processing, dependent on brain region.
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