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Dear He This sounds a bit surprising to me. Are you sure that you have not changed anything else e.g. modelling of serial correlation? Best Torben Torben Ellegaard Lund Assistant Professor, PhD The Danish National Research Foundation's Center for Functionally Integrative Neuroscience (CFIN) Aarhus University Aarhus University Hospital Building 30 Noerrebrogade 8000 Aarhus C Denmark Phone: +4589494380 Fax: +4589494400 http://www.cfin.au.dk [log in to unmask] On 19/10/2007, at 6.24, Hongjian He wrote: > Hi, SPMers, > We met a problem on high pass filter and don't know what value > should be chosen as a high cut off. > Our experiment was block-designed with TR = 2s, 12 scans(=24s) for > each task/control block and a total of 96 images( 8 blocks) collected. > During SPM modeling, we used 1/128 (as default) and 1/130 for high > cut off. However, but got totally different results finally. > I wonder why such small changes to the filter can result in big > difference in finally result, and then how to make a good and > resonable filter. > > Best regards! > -- > 何宏建, He Hongjian > Biox laboratory of physics department, Zhejiang University. > Zheda Road 38, Hang Zhou, China. > 310027 > Phone: 86-571-87952811