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