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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