Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.
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.
Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea.|Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, United Kingdom.|Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea.|Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Korea.
Hyojin
H
Park
Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea.|Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea.|Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Korea.|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.
Dong Soo
DS
Lee
Department of Psychology, Kangwon National University, Chuncheon, 200-701, Korea.
Eunjoo
E
Kang
Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea.|Data Science for Knowledge Creation Research Center, Seoul National University, Seoul, Korea.
Hyejin
H
Kang
Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea.|Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea.|Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Korea.
Jarang
J
Hahm
Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.
June Sic
JS
Kim
Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Korea.|Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.
Chun Kee
CK
Chung
Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands.
Haiteng
H
Jiang
Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, United Kingdom.
Joachim
J
Gross
Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands.
Ole
O
Jensen
D000328:Adult; D000513:Alpha Rhythm; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D065818:Gamma Rhythm; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008568:Memory / Q000502:physiology*; D010775:Photic Stimulation; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult