Hello all,

I don't have an excellent mathematical background and I would like to understand better ICA. What is the meaning of the IC weights in the colour bar of Melodic? Are some voxels more “important”? On one hand I read that in an IC map all the voxels share the same timecourse, and on the other hand I read that the higher IC weights mean how much the timeseries of that voxel contributes to the IC signal, I'm confused. Is IC timeseries = weight_voxel1 * timecourse_voxel1 + weight_voxel2 * timecourse_voxel2 and so on?

Thank you,

Best wishes,

John