1. A method for processing MRT data of the human brain of a patient, wherein three-dimensional MRT data resolved in voxels of the patient's brain and the brains of a normative database of a plurality of neurologically healthy human individuals are available, comprising the steps of: segmenting the MRT data of the patient's brain for each voxel into portions of grey substance, white substance and liquor by means of a classification algorithm, transforming the data to be compared with corresponding data of the normative database into a standardized stereotactic space, resulting in one or more normalized tissue maps that contain the proportions determined by the classification algorithm, wherein the transformation occurs before, after or synchronous with segmentation, and subjecting the tissue map or tissue maps of the patient's brain to a voxel-wise statistical comparison with the correspondingly normalized and segmented data of the normative database, wherein the voxel-wise statistical comparison of the tissue map, or tissue maps, is a morphometric comparison, wherein those statistically significant voxels in the tissue map, or tissue maps, of the patient's brain are identified that belong to a region dominated by the white substance that contains more grey substance than should be expected from the normative database, or that belong to a region dominated by the grey substance that contains more white substance than would be expected from the normative database.