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Gating of memory encoding of time-delayed cross-frequency MEG networks revealed by graph filtration based on persistent homology

Article scientifique 2017 Anglais

Résumé

To explain gating of memory encoding, magnetoencephalography (MEG) was analyzed over multi-regional network of negative correlations between alpha band power during cue (cue-alpha) and gamma band power during item presentation (item-gamma) in Remember (R) and No-remember (NR) condition. Persistent homology with graph filtration on alpha-gamma correlation disclosed topological invariants to explain memory gating. Instruction compliance (R-hits minus NR-hits) was significantly related to negative coupling between the left superior occipital (cue-alpha) and the left dorsolateral superior frontal gyri (item-gamma) on permutation test, where the coupling was stronger in R than NR. In good memory performers (R-hits minus false alarm), the coupling was stronger in R than NR between the right posterior cingulate (cue-alpha) and the left fusiform gyri (item-gamma). Gating of memory encoding was dictated by inter-regional negative alpha-gamma coupling. Our graph filtration over MEG network revealed these inter-regional time-delayed cross-frequency connectivity serve gating of memory encoding.

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Hahm, J., Lee, H., Park, H., Kang, E., Kim, Y., Chung, C., Kang, H., Lee, D. (2017). Gating of memory encoding of time-delayed cross-frequency MEG networks revealed by graph filtration based on persistent homology. https://doi.org/10.1038/srep41592

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Auteur(s)

Jarang Hahm Hyekyoung Lee Hyojin Park Eunjoo Kang Yu Kyeong Kim Chun Kee Chung Hyejin Kang Dong Soo Lee

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