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The AAL-VOIs atlas is the automatic anatomical labeling result [5] of the spatially normalized, single subject, high resolution T1 MRI data set provided by the Montreal Neurological Institute (MNI)[6]. It includes 120 structure definitions. By merging some small structures an AAL-Merged atlas was created. Both AAL-VOIs and AAL-Merged can be used alternatively to the N30R83 atlas. There is a slight asymmetry in the AAL VOIs which corresponds to the natural asymmetry of normal brains and which is also part of the MNI template.

In general, it should be noted that from a theoretical point of view a maximum probability atlas is preferable, because it accounts for the normal variation of the human brain anatomy.