The human mind is the totality of all conscious and unconscious mental processes that have been occurred or are occurring in the brain. Mind disorders, from mild emotional disorders to severe illness, are studied and treated in various ways. Psychology is the scientific study of the mind and behavior. Psychology involves research into feelings, intelligence, learning, memory perception, personality development, speech and thought. Psychologists may also diagnose and treat mental, behavioral or emotional problems through psychotherapy although since they lack medical qualification. Psychotherapy is the use of psychological methods to treat mental behavioral or emotional problems such as neuroses and personality disorders. Treatment is based on the relationship between sufferer and psychotherapist. Following the framework of the type of therapy used, they talk about symptoms and problems in an attempt to find a solution. Psychiatry is a branch of medicine concerned with research into, and the prevention, diagnosis and treatment of mental illness. Psychiatry sees mental disorders as medical conditions. Psychiatrists are medically qualified and may use psychotherapeutic drugs to treat patients. Psycho therapeutic drugs used in the treatment of mental disorders, these can be very effective in the alleviation of symptoms both long and short term although some carry risk of dependence.