There is provided an apparatus, a method and a computer program. The apparatus comprises medical imaging unit for generating a group of voxel values of a patient, a voxel value representing an electromagnetically detectable functional state in a brain voxel of the patient, data processing unit for generating from the group of voxel values of the patient an indication that represents a level of a specific medical disorder of the patient, and illumination unit for directing non-invasively a dose of light to the brain of the patient.
