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Another alternative is to added N regressors for each bad trial. Where N is the expected length of the response. This essentially removes the effect of the frames from bad trials. Each regressor added should have a 1 for a bad frame. So that n-1 frames will have a value of zeros and the bad frame will have a value of 1. On Fri, Aug 29, 2008 at 3:17 PM, <John> <Gelburg> <[log in to unmask]> wrote: > Hi, > > I am creating my ER design with optseq. Suppose some volumes I don't want to > include in my analysis (for example, incorrect subject' behavioral > response). Is it possible just to remove the volume and numbers of > consecutive events will be shifted? I would assume this to be problematic > from ER deconvolution point of view. Then, is it's possible, what is the > correct way to do this. > > Thanks! > -- Best Regards, Donald McLaren ===================== D.G. McLaren University of Wisconsin - Madison Neuroscience Training Program Tel: (773) 406 2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406 2464 or email.