Hi - if you run the GUI (which should now work ok) then it will output the correct command line in the terminal when you press "GO". You can look at these command lines and figure out what each option does. Hope this is useful T ------------------------------------------------------------------------------- Tim Behrens Centre for Functional MRI of the Brain The John Radcliffe Hospital Headley Way Oxford OX3 9DU Oxford University Work 01865 222782 Mobile 07980 884537 ------------------------------------------------------------------------------- On Thu, 28 Oct 2004, Liang Xuan wrote: > Thansks for your reply. So would you please give me an example, show how > to use probtrack in command line? >