Thank you! That works great!

I have two additional questions (and hopefully my last questions - thanks again for all of your help):

1) When I run 2 sessions at a time, I do get similar beta coefficients, but I get a slightly bigger T-Stat than if I run each run individually. Do you know why that is?

2) For one of my datasets, I ran the same scan twice and participants did the exact same task each time. For this, my plan is to average the two runs with:

gltsym 'SYM: 0.5*run1 +0.5*run2'

within each run, I would like to do a contrast of the means for a specific taks (each run contains a block design: rest, lefthand, rest, right hand, rest, both hands, rest). For example:

-gltsym 'SYM: (0.5*run1Task1 +0.5*run2Task1) - (0.5*run1Task2 +0.5*run2Task2)'

The gltsym does not like it when I use parenthesis. How can I denote this properly?

Thanks