Hi AFNI experts,
When I use 3fim+ for the seed-based analysis, I often see many zeros (many small “holes” in the final correlation map). I had always thought that they were real zeros. But I just noticed that sometimes, it happens even very close to the seed, (and all neighboring voxels are close to 1, as they should).
This is my command line (mask_ideal is created with 3dmaskave in a mask created with 3dUndump). I tried with different -out options, but these zeros are always in the same voxels.
3dfim+ -input errts_file -ideal_file targetTimeSerie -out 'Spearman CC' -bucket $targetCorrelationMap
I took the timeserie for one voxel at the time, and computed the correlation coefficient:
3dmaskave -q -xbox x y z errts_file >> Voxel_x_y_z_timeSerie.1D 3dfim+ -input1D Voxel_x_y_z_timeSerie.1D -ideal_file targetTimeSerie -out 'Spearman CC'
In non-zero voxels, the result was exactly the same. However, in the buggy voxel, I suddenly had a more realistic result (close to 1).
Can you please advise me on what to do?