Dear SPMers: I knew the possible compatibility problems of BPM and SPM8 as shown in http://ansir.wfubmc.edu/software/Bpm#SPM8. I met some errors when performing BPM with partial correlation analysis for VBM results and SPECT images that prepared by SPM8, such as DARTEL and other tools. Therefore, I changed my SPM version to SPM5 but I have the same results. Finally, I tried the suggested method as copying some files to the wfu_toolboxes/wfu_pickatlas directory but I still had the same error messages as below: Error in ==> spm_u at 23 if STAT == 'Z' ??? Output argument "u" (and maybe others) not assigned during call to "H:\005 Academic\SPM5\spm5\spm5\spm_u.m>spm_u". Error in ==> spm_getSPM at 654 u = spm_u(u^(1/n),df,STAT); Error in ==> spm_results_ui at 275 [SPM,xSPM] = spm_getSPM; ??? Error while evaluating uicontrol Callback I wonder if I wanted to perform correlation analysis by BPM, I only could perform all image analysis and process in SPM5? Thanks! David