Independent dynamics of low, intermediate, and high frequency spectral intracranial EEG activities during human memory formation
Language English Country United States Media print-electronic
Document type Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.
PubMed
34644594
DOI
10.1016/j.neuroimage.2021.118637
PII: S1053-8119(21)00910-1
Knihovny.cz E-resources
- Keywords
- Alpha, Beta, Brain rhythms, Cognitive functions, Declarative memory, ECoG, Gamma, Intracranial EEG, Neuroscience, Spectral analysis, Stereo EEG, Theta,
- MeSH
- Datasets as Topic MeSH
- Adult MeSH
- Electroencephalography methods MeSH
- Epilepsy diagnostic imaging surgery MeSH
- Humans MeSH
- Magnetic Resonance Imaging MeSH
- Memory physiology MeSH
- Tomography, X-Ray Computed MeSH
- Check Tag
- Adult MeSH
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Multicenter Study MeSH
- Research Support, Non-U.S. Gov't MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
A wide spectrum of brain rhythms are engaged throughout the human cortex in cognitive functions. How the rhythms of various frequency ranges are coordinated across the space of the human cortex and time of memory processing is inconclusive. They can either be coordinated together across the frequency spectrum at the same cortical site and time or induced independently in particular bands. We used a large dataset of human intracranial electroencephalography (iEEG) to parse the spatiotemporal dynamics of spectral activities induced during formation of verbal memories. Encoding of words for subsequent free recall activated low frequency theta, intermediate frequency alpha and beta, and high frequency gamma power in a mosaic pattern of discrete cortical sites. A majority of the cortical sites recorded activity in only one of these frequencies, except for the visual cortex where spectral power was induced across multiple bands. Each frequency band showed characteristic dynamics of the induced power specific to cortical area and hemisphere. The power of the low, intermediate, and high frequency activities propagated in independent sequences across the visual, temporal and prefrontal cortical areas throughout subsequent phases of memory encoding. Our results provide a holistic, simplified model of the spectral activities engaged in the formation of human memory, suggesting an anatomically and temporally distributed mosaic of coordinated brain rhythms.
Department of Computer Engineering Iowa State University Ames Iowa USA
Department of Electrical and Computer Engineering University of Illinois Urbana Champaign IL USA
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