Take a look at this: http://mumford.bol.ucla.edu/perchange_guide.pdf Hope this helps, David -----Original Message----- From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Sebastien Helie Sent: Thursday, August 27, 2009 1:26 PM To: [log in to unmask] Subject: [FSL] Featquery % signal change Does anyone know how featquery calculates the % of signal change for event-related designs (i.e., how it is scaled, mathematically). Thank you. ----------------------------------- Sebastien Helie, Ph.D. Postdoctoral researcher Department of Psychology University of California, Santa Barbara Santa Barbara, CA 93106-9660 -- Office: Psychology East (Bldg. 251), Rm. 3803 Phone: (805) 893-7909 Fax: (805) 893-4303 E-mail: [log in to unmask] Website: http://www.psych.ucsb.edu/~helie ------------------------------------