 Scientific background Obsessive Compulsive Disorder OCD Obsessive Compulsive Disorder OCD is a chronic mental disturbance classified as an anxiety disorder, which causes a severe social and occupational damage. It is characterized with repetitive and intrusive thoughts, and with the urge to perform reoccurring rituals. Illness course is usually chronic and is characterized with fluctuation in symptoms severity. Only a minority of patients gain full relief, even following the appropriate treatment. There are two main useful treatments, a behavioral therapy and a medicinal treatment using SSRIs. Even though medicinal treatments are improving, large amount of patients are irresponsive to a variety of medicinal treatment and about a third is classified as Refractory to Treatment. Of those who will gain relief, relapse rate is high Catapano et al., 2006. 