Dear SPM5 users I have been trying to do the 3D source reconstruction on the mae_eeg dataset from the SPM homepage. I have some problems with building the model. It seems that I have succeeded the MRI normalization step, since the file amri_vbm_inv_sn_1.mat is generated. The problem arises when I’m asked to ”Select inner-skull bin mask”. Here I should choose amri_iskull.img, right? I have tried just to close the window and the next thing I’m asked for, is to ”Select scalp bin mask”. Is it the amri_oscalp.img I should choose here? The main problem is that I can’t find the amri_iskull.img and amri_oscalp.img on my computer. Do someone know what I’m doing wrong? I really hope that someone can help me :-) Thanks, Carsten PS. This is what I have done step by step - Added the path to SPM5 and all its subdirectories. - Created fid_eeg.mat, fid_mri.mat, sensors_orig.mat, and headshape_orig.mat with the script create_fid_files.m. (I have deleted the first 6 lines in sensors.pol and the first 3 lines in headshape.pol since these coordinates corresponded to the fiducials in the create_fid_files.m. Is it wrong to do this?) - 3D source reconstruction: Loaded the mae_eeg.mat with the user interface and pushed the button “Meshes”. - Selected “amri.img,1”. The “amri_vbm_inv_sn_1.mat”, “amri_vbm_sn_1.mat“, c1amri.img”, “c2amri.img”, “c3amri.img”, and “mamri.img” was generated. - And then I was asked “Select inner-skull bin mask” Before I was asked to select the inner-skull bin mask the following was printed in Command Window: ans = sMRI: [1x73 char] nobias: [1x72 char] def: [1x80 char] invdef: [1x84 char] msk_iskull: '' msk_scalp: '' msk_flags: '' tess_ctx: '' Ctx_Nv: '' Ctx_Nf: '' tess_iskull: '' Iskull_Nv: '' Iskull_Nf: '' tess_scalp: '' Scalp_Nv: '' Scalp_Nf: '' CtxGeoDist: '' InterpMat: '' Msize: 1