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Hi Liam and Carlos, you can try my rfxplot toolbox that -- among other things -- can extract beta/con values and converts them to %SC starting from a 2nd levee analysis, but it also cycles back through the 1st level SPM.mat. It comes with an extensive user manual. Importantly, the 1st level analysis folders need to be intact (i.e. no images should be move elsewhere without updating the SPM struct). I mention it here, because it is not emphasized in the manual Have a look at http://rfxplot.sourceforge.net Good luck, Jan -- Jan Gläscher, Ph.D. === PI of Bernstein Research Group "Valuation in the Human Brain" University Medical Center Hamburg-Eppendorf Institute for Systems Neuroscience Martinistr. 52, Bldg. W34 20246 Hamburg office: +49 40 7410 58804 fax: +49 40 7410 59955 email: [log in to unmask] === Visiting Associate in Psychology and Neuroscience California Institute of Techology Div of Humanities and Social Science 1200 E. California Blvd. Pasadena, CA 91125, USA email: [log in to unmask] On Wednesday, May 2, 2012 at 8:03 PM, Liam Mason wrote: > Hi Carlos, > > Did you get any answer of if it is possible to extract %SC from a group of subjects? I'm afraid the only way I know is to do them iteratively as you say. If marsbar is able to do it from a second-level (group) SPM file, then would be keen to know! > > > Liam > > --- > School of Psychological Sciences > University of Manchester > 0161 275 2692 > > ________________________________________ > From: SPM (Statistical Parametric Mapping) [[log in to unmask] (mailto:[log in to unmask])] on behalf of Ming-Tsung Tseng [[log in to unmask] (mailto:[log in to unmask])] > Sent: 24 April 2012 18:14 > To: [log in to unmask] (mailto:[log in to unmask]) > Subject: Re: [SPM] Compare 2 methods to extract %signal change in MarsBaR > > Hi Matthew, > > Excellent to get your clear explanation!! > > So I can use Method 2 to extract Beta values in a group of subjects, right?? > > One more question: Since %SC and Beta value can both represent neural response in an ROI, which one is better?......I mean, if I want to extract %SC, I have to use Method 1 which will be performed subject by subject and time-consuming (or any time-saving way to get %SC within many ROIs in a group of subjects)? > > Thanks indeed! > > Carlos