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Are you mixing SPM99 and SPM2? If so, then things could be a little unpredictable. If everything is done in SPM99, then (if I remember correctly - because 1999 was a long time ago) the Jacobian determinant map should correspond with the template image that you used in terms of laterality. There were various versions of spm_Deformations, but there was a final version that was included in SPM2. Best regards, -John > I am using your spm_Deformations script to create Jacobian determinant > images from sn3d.mat files generated by SPM99. Will the left-right > orientation of these Jacobian determinant images be in correspondence to > that of the spatially normalized structural images that were used to > generate the sn3d.mat files? This is an overcautious question motivated > simply by the difference in how laterality is dealt with in SPM99 and SPM2 > (and the presumption that you wrote the spm_Deformations script with SPM2 > in mind). > > Relatedly, how would you like your script to be cited in papers (since it > it is not officially part of the SPM2 package, or is it?)?