Dear SPM authors,

      I just can’t find the low pass filtering with a Gaussian kernel in spm99 (Friston et al., 2000) in SPM2 and SPM5. Is this removed or not necessary any more? If it is removed, why? since according to Friston et al., 2000 (smooth or not smooth? …), AR(1) is not sufficient to remove the autocorrelation and a combination with a bandpass filtering is able to solve this problem.



Thank you very much!


Ze Wang, Ph. D

Center for functional neuroimaging,

Dept of Neurology,

Medicine school,

University of Pennsylvania

3400 Spruce Stree,

3W Gates building,

Philadelphia, PA 19104

Tel: 215-662-7341