Substance Use in Elderly Individuals: Brain and Cognitive Correlates and the Effect of Psychotherapy

Inclusion Criteria: * Subjects aged 65 or above with, according to WHO-ASSIST V3.0, a hazardous consumption of alcoholic beverages and / or benzodiazepines and / or non-benzodiazepine hypnotics (zolpidem, zopiclone, zaleplon) * The subjects must be able to understand verbal and written information about the study flow and content and to give their written consent. * The subjects must be able to understand and perform verbal and written tasks (cognitive tests / questionnaires) Exclusion Criteria: * Taking medication that could affect cognition outside of benzodiazepines and / or non-benzodiazepine hypnotics (zolpidem, zopiclone, zaleplon). * Drug treatments with anxiolytics (benzodiazepines) as part of an ongoing drug-assisted detoxification * Taking antidepressant medication * Taking sleep-inducing substances (for example Dipiperon®, Trittico®, Valverde Sleep® or Valverde Entspannung®) * Taking other anxiolytic active substances (for example, pregabalin, Opipramol). The use of medication is allowed to treat somatic diseases. * Use of drugs or substance dependence. Except for alcohol, benzodiazepines and non-benzodiazepine hypnotics (zolpidem, zopiclone, zaleplon) * Diseases which prevent the subject from giving consent for this study or which impair cooperation in the investigation. * Severe and / or unstable physical illness: severe depression, severe mania, delirium, severe cognitive impairment (mini-mental status test \< 20/30 points), dementia of the Alzheimer type or other dementias, multiple sclerosis, clinically manifest structural brain damage (eg cerebral hemorrhage, brain tumors, MRI findings by Schulthess clinic) * Heavily impaired vision and eye diseases Additional exclusion criteria for part 2 of the study: * Pacemaker, implantable cardioverter defibrillator (ICD), neurostimulator, aneurysm clip, prosthetic heart valve, valve prosthesis, metal prosthesis * Clips after surgery, metallic bone plates, artificial joints, metal fragments in the body, professional in the metal processing industry, non-removable piercing, ferruginous tattoo ink * Pregnancy * Claustrophobia * Use of alcohol or other consciousness-altering substances within 24 hours prior to the MRI scan (exceptions: see "exclusion criteria")