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Dear Michael, Thanks for your kind reply. Is it right in SPM5 I operate it like the following? Data&Design->Subject/Session->Conditions-Condition-Parametric Modulations (here, input the RTs?) If I just interest in the neural activity between the onset of the event and its response and also want to regress the RT, does it right to input the RT into the Duration and also to input the RT into the Parametric Modulations (here, I want to take RT as covariate). Am I right? Best wishes, Xiuqin Jia 2011/8/13 Michael T Rubens <[log in to unmask]> > 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 > -- Xiuqin Jia, Ph.D Candidate Department of Radiology, Xuanwu Hospital, Capital Medial University, 45 Changchun Street, Xuanwu District, Beijing, 100053 China Tel: (+086)-138-1012-5607