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Not only can they be different, but according to the paper cited below they may be systematically different, with smoothing tending to shift t-map peaks but not COPE peaks toward white matter or other areas with reduced variance. Reimold M, Slifstein M, Heinz A, Mueller-Schauenburg W, Bares R. Effect of spatial smoothing on t-maps: arguments for going back from t-maps to masked contrast images. J Cereb Blood Flow Metab. 2006 Jun;26(6):751-9. Dan On 6/14/07, Benny Liberg <[log in to unmask]> wrote: > Hi, > > How can the t/zstat and the PE/COPE peak co-ordinates be different? > > Which peak does -x in avwstats refer to? > > Regards, > Benny >