Select and Cluster: A Method for Finding Functional Networks of Clustered Voxels in fMRI

Figure 2

2D visualization of the 3D multiscale correlation analysis procedure implemented. (a) Coarse voxels time series are derived from fine scale cortical voxels and an all to all correlation analysis is performed; (b) the downsampling coarse grid is shifted and the correlation analysis is repeated on the corresponding new set of coarse voxels time series; (c) a Binary Mask is derived from the union of all coarse voxels (blue squares from first correlation analysis and red squares after the grid shift) involved in at least one significant connection in one of the two coarse level correlation analyses. (d) Fine scale correlation analysis performed on the set of voxels in the output from the coarse scale correlation analysis. (e) A fine scale binary mask derived from the union of all cortical voxels involved in at least one significant connection at the fine scale (in black are the voxels eliminated from the correlation).

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