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Abstract #4142

Frequency Correspondence between fMRI and EEG signals before and after Sleep

Yu-Ting Ko 1 , Pai-Chuan Hung 1 , Geng-Hong Lin 1 , Pei-Jung Tsai 2 , Ching-Po Lin 3 , and Changwei W Wu 1

1 Graduate Institute of Biomedical Engineering, National Central Unversity, Taoyuan, Taiwan, 2 Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan, 3 Institute of Neuroscience, Nation Yang-Ming University, Taipei, Taiwan

The resting-state fMRI signal is the baseline fluctuations with non-linear and non-stationary properties; thus its underlying mechanism was quite fussy. From the frequency viewpoints, we attempted to retrieve its physiological implications by observing the frequency correspondence between fMRI and EEG. Therefore, we simultaneously recorded fMRI and EEG signals in 2 conditions (before and after sleep) and used the Hilbert-Huang Transform to extract their spectral correspondence. In our results, we found the opposite frequency correspondences between EEG and fMRI in the resting state, especially in the low frequency range, resembling previous studies. Furthermore, such correspondence deviates in different physiological conditions.

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