Fig. 6.

fMRI responses can be detected reliably up to 0.75 Hz. (A) In experiment 3, at 7 T, oscillatory stimuli at 0.2 Hz evoked consistent and large responses. (B) At 0.75 Hz, the evoked oscillations were still statistically detectable and were ∼1% of the amplitude of the 0.2-Hz signal. (C and D) A non-visually activated gray matter control ROI does not show oscillatory responses, suggesting that the detected oscillation is caused by neural activity rather than by motion or physiological noise. In all panels, the shaded region shows the SE across runs.