I am wondering if it is possible to use the gltsym option to calculate a contrast on the single subject level on an existing statistical BRIK output from a previous 3ddeconvolve operation. More specifically, I calculated single trial beta values using the stim_times_IM option, and I now want to calculate a linear trend across each subsequent trial of each condition. I know that I could redo this in a new 3ddeconvolve script with these gltsym options added, but this would require redoing all steps of the single trial beta calculation which is a bit time consuming over many participants. I also know I could code this in 3dcalc, but this option feels clunky compared to using the gltsym options. Any advice regarding 3ddeconvolve or performing this in 3dcalc is appreciated.