Figure 2.
Crosstalk versus assumed SNR. Crosstalk is shown for 10 sources (point and 2 cm in diameter), with and without orientation constraint. The assumed SNR was either 1, 10, 100, or infinite. A relative fMRI weighting of 100% was used. The results indicate that allowing for finite SNR greatly reduces the predicted distortion from fMRI invisible sources. The extremely large amount of distortion from fMRI invisible sources, observed when assuming infinite SNR, demonstrates a potential problem with an fMRI-constrained pseudoinverse solution (which implicitly assumes infinite SNR).