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Abstract #0355

Direct measurement of delta frequency oscillations using fMRI

Laura D Lewis 1 , Jonathan R Polimeni 2 , Kawin Setsompop 2 , and Bruce R Rosen 2

1 Society of Fellows, Harvard University, Cambridge, MA, United States, 2 Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Harvard Medical School, Massachusetts General Hospital, Boston, MA, United States

EEG recordings have demonstrated that neural oscillations above 0.1 Hz are important for cognitive function, but these frequencies are too high to be measured directly with traditional fMRI. We used fast acquisition (TR=246 ms) to study whether fMRI can detect continuous neuronal oscillations at high frequencies. We presented periodic visual stimuli and found that the BOLD signal in V1 matched the input frequency at rates up to 0.33 and 0.5 Hz. The phase of the response depended on stimulus dynamics. We conclude that fMRI can directly measure neural oscillations at the lowest end of the delta (0.25-4 Hz) band.

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