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hi, Darren, Thanks for your quickly reply. I know that Beta values do not directly represent the signal change. But many paper reported the beta (task) as the percent signal change associated with that task, as mentioned in one of Will's mail http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind04&L=spm&P=R392137&I=-1. Thus, i am wondering what reference i can cite if i also use the beta in my paper. thanks and best, hengyi ---------------------------- >Dear Hengyi: > >Beta values do not represent signal change, at least not in the direct >sense. Please look at Matthew Brett's marsbar faq for a clear explanation >of the relationship between beta's and percent signal change. > >http://marsbar.sourceforge.net/faq.html > >Darren > >At 03:19 PM 3/25/2005, [log in to unmask] wrote: >>Dear SPM members, >> >>If i report beta value to represent the percent signal change associated >>with the task in my paper, what references shoulf i cited? >> >>thanks and best >> >>---------------------------- >>Hengyi Rao, Ph.D. >>[log in to unmask] >>Department of Neurology >>University of Pennsylvania >>3 W Gates >>3400 Spruce Street >>Philadelphia, PA, 19104 >>---------------------------- > > >------------------------------------------------------------------------- >Darren R. Gitelman, M.D. >Cognitive Neurology and Alzheimer箂 Disease Center >Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611 >Voice: (312) 908-9023 Fax: (312) 908-8789 >------------------------------------------------------------------------- = = = = = = = = = = = = = = = = = = = =