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Dear Experts,

I'm trying to use MELODIC gui to run ICA on a series of activation likelihood estimation (ALE) maps. Hence, my input is a 4D nii where each volume is an unthresholded ALE map, and I'm treating it as a single subject, setting TR=1 (is this right?)
Since data are not "real fmri" I'm not applying preprocessing. Related to this, which value should I set for high pass filter cut-off?

I get the following error during Preprocessing:Stage 2


/usr/local/fsl/bin/fslstats prefiltered_func_data -p 2 -p 98
0.000000 0.004092 

/usr/local/fsl/bin/fslmaths prefiltered_func_data -thr 0.0004092 -Tmin -bin mask -odt char

/usr/local/fsl/bin/fslstats prefiltered_func_data -k mask -p 50
0.000000 

/usr/local/fsl/bin/fslmaths mask -dilF mask

/usr/local/fsl/bin/fslmaths prefiltered_func_data -mas mask prefiltered_func_data_thresh
divide by zero
    while executing
"if { [ catch {

for { set argindex 1 } { $argindex < $argc } { incr argindex 1 } {
    switch -- [ lindex $argv $argindex ] {

	-I {
	    incr arginde..."
    (file "/usr/local/fsl/bin/feat" line 312)
Error encountered while running in main feat script, halting.
divide by zero

I checked the mask file and realized that is an all 0 file.
So I manually performed this command 

/usr/local/fsl/bin/fslmaths prefiltered_func_data -thr 0.0004092 -Tmin -bin mask -odt char

but removing the option -Tmin and the mask file now has values inside.
However I'm not able to procede with the analyses.

So my question is, if the error I get is really due to the -Tmin option, what could I do to solve it and run ICA without problems?

Thank you for your help.
Cheers,

Jordi

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