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That is one option. The other is to input it as a parametric modulator. It depends what you want to look and what you're hypothesis is. see some of grinband's findings on the subject. cheers, Michael On Fri, Aug 12, 2011 at 6:54 AM, xiuqin jia <[log in to unmask]> wrote: > Dear SPM Experts, > > > How can I operate in SPM to take the response times (RTs) as the regressor > covariate? Dose it right to take the *RTs* of the trials as the *Durations > *? > > That is, in SPM, Data&Design->Subject/Session->Condition->*Durations > (here, inputing the RTs)*. > > Any comments are really appreciated. > > Thanks in advance. > > Best Regards, > > Xiuqin Jia > > > -- Research Associate Gazzaley Lab Department of Neurology University of California, San Francisco