| Presentation | 2011-07-26 Detection of alpha phase modulation caused by visual input Yasushi NARUSE, Ken TAKIYAMA, Masato OKADA, Hiroaki UMEHARA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Ongoing oscillations in electroencephalogram (EEG) and magnetoencephalogram (MEG) have recently gained attention, since they are synchronized among cortical areas. This phenomenon is caused by phase modulations of the ongoing oscillations. In order to detect phase modulations, we averaged many trials since the signal to noise ratio of EEG and MEG was low. Thus, we have detected only the phase modulations that are synchronized between trials. However, all of the phase modulations are not synchronized between trials, and therefore, we have missed many of the modulations that are not synchronized between trials. In this study, we developed a novel method for detecting phase modulations of the ongoing oscillations in a single trial. We modeled the phase and amplitude of an ongoing oscillation as Markov random field models based on our previous study. Our method used the line process to detect modulations of the phase and amplitude of an ongoing oscillation. By using our method, we detected phase modulations of the alpha rhythm in flash EEG data after the flash stimulus onset. This result suggests that our method is useful to detect phase modulations of ongoing oscillations. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Markov random field model / Line process / Electroencephalography / Alpha rhythm / Phase modulation |
| Paper # | NC2011-33 |
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| Committee | NC |
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| Conference Date | 2011/7/18(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Neurocomputing (NC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Detection of alpha phase modulation caused by visual input |
| Sub Title (in English) | |
| Keyword(1) | Markov random field model |
| Keyword(2) | Line process |
| Keyword(3) | Electroencephalography |
| Keyword(4) | Alpha rhythm |
| Keyword(5) | Phase modulation |
| 1st Author's Name | Yasushi NARUSE |
| 1st Author's Affiliation | Advanced ICT Research Institude, National Institute of Information and Communications Technology() |
| 2nd Author's Name | Ken TAKIYAMA |
| 2nd Author's Affiliation | Graduate School of Frontier Sciences, The University of Tokyo |
| 3rd Author's Name | Masato OKADA |
| 3rd Author's Affiliation | Graduate School of Frontier Sciences, The University of Tokyo:Brain Science Institute, RIKEN |
| 4th Author's Name | Hiroaki UMEHARA |
| 4th Author's Affiliation | Advanced ICT Research Institude, National Institute of Information and Communications Technology |
| Date | 2011-07-26 |
| Paper # | NC2011-33 |
| Volume (vol) | vol.111 |
| Number (no) | 157 |
| Page | pp.pp.- |
| #Pages | 4 |
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