The Smoothing Artifact of Spatially Constrained Canonical Correlation Analysis in Functional MRI

Figure 2

Example of the calculated joint probability density 𝑝(𝜔,CNR∣𝑠,𝑀) for motor activation data for a neighborhood size 𝑠=5 and cCCA with the maximum constraint. The function was determined using 2D kernel density estimation with a 2D Gaussian kernel. The variables 𝜔 and CNR specify the statistic and the contrast-to-noise ratio of the 5-voxel neighborhood, respectively. The threshold to obtain FWE <0.05 is 𝜔₀=6.7.