This is definitely possible. There's a few ways you could do this. The first method would be to use the rand() function.
http://www.empirisoft.com/directrt/h...dom_values.htm
Using this function allows for the input file to be dynamically updated with one of the 10 stimuli before the file is presented to the user.
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Another method would be to use a random stimlist. More information on stimlists can be found here:
http://www.empirisoft.com/directrt/h...ectrt_stim.htm
A random stimlist would be able to randomly select 5 of the 10 stimuli. Take a look at the Samples folder, and try out one of the stimlist samples. The path to this folder is most likely as followed: "C:\DirectRT\Samples\1 - Bare Bones".