Psychotherapy is the treatment of mental and emotional disorders using psychological methods. Psychotherapy, thus, does not include physiological interventions, such as drug therapy or electroconvulsive therapy, although it may be used in combination with such methods. Behaviour therapy aims to help the patient eliminate undesirable habits or irrational fears through conditioning. Techniques include systematic desensitisation, particularly for the treatment of clients with irrational anxieties or fears, and aversive conditioning, which uses negative stimuli to end bad habits. Humanistic therapy tends to be more optimistic, basing its treatment on the theory that individuals have a natural inclination to strive toward self-fulfilment. Therapists such as Carl Rogers and Abraham Maslow used a highly interactive client-therapist relationship, compelling clients to realise exactly what they are saying or how they are behaving, in order to foster a sense of self-awareness. Cognitive therapies try to show the client that certain, usually negative, thoughts are irrational, with the goal of restructuring such thoughts into positive, constructive ideas. Such methods include rational-emotive therapy, where the therapist argues with the client about his negative ideas, and cognitive restructuring therapy, in which the therapist works with the client to set attainable goals. Other forms of therapy stress helping patients to examine their own ideas about themselves.