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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 Alzheimer¹s Disease Center Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611 Voice: (312) 908-9023 Fax: (312) 908-8789 -------------------------------------------------------------------------