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Comparison of hemodynamic response to visual stimulation recorded by OIS at 620 nm (blue bar) and 700 nm (red bar). The magnitude of the OIS signal at twice the frequency of stimulus rotation (0.0333 Hz) was isolated and used to compare the sensitivity to the hemodynamic response for these two wavelengths. We consistently observed a larger response in brain tissue areas at 620 nm compared to 700 nm.
