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Sci Rep. 2016 Jun 16;6:28092. doi: 10.1038/srep28092.

Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.

Park H1,2,3,4, Lee DS1,3,4,5, Kang E6, Kang H1,7, Hahm J1,3,4, Kim JS8, Chung CK4,8, Jiang H9, Gross J2, Jensen O9.

Author information

1
Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea.
2
Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, United Kingdom.
3
Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea.
4
Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Korea.
5
Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology and College of Medicine or College of Pharmacy, Seoul National University, Seoul, Korea.
6
Department of Psychology, Kangwon National University, Chuncheon, 200-701, Korea.
7
Data Science for Knowledge Creation Research Center, Seoul National University, Seoul, Korea.
8
Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.
9
Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands.

Abstract

Neuronal oscillations provide a window for understanding the brain dynamics that organize the flow of information from sensory to memory areas. While it has been suggested that gamma power reflects feedforward processing and alpha oscillations feedback control, it remains unknown how these oscillations dynamically interact. Magnetoencephalography (MEG) data was acquired from healthy subjects who were cued to either remember or not remember presented pictures. Our analysis revealed that in anticipation of a picture to be remembered, alpha power decreased while the cross-frequency coupling between gamma power and alpha phase increased. A measure of directionality between alpha phase and gamma power predicted individual ability to encode memory: stronger control of alpha phase over gamma power was associated with better memory. These findings demonstrate that encoding of visual information is reflected by a state determined by the interaction between alpha and gamma activity.

PMID:
27306959
PMCID:
PMC4910116
DOI:
10.1038/srep28092
[Indexed for MEDLINE]
Free PMC Article

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