A research group led Miguel Angel Fullana, researcher at the Universitat Autonoma de Barcelona Department of Psychiatry and Legal Medicine, psychologist the Institute of Psychiatric Treatment of Hospital de Mar in Barcelona and researcher at King's College Institute of Psychiatry, London, has carried out a first study which connects the symptoms of obsessive-compulsive rituals in childhood with the risk of developing an obsessive-compulsive disorder as adults. One of the main conclusions of the study is that children who repeatedly manifest having obsessions and compulsions notably increase their risk of suffering from a disorder later in life.
2. Alegret, M., Junque, C., Valldeoriola, F., Vendrell, P., & al, e. (2001). Obsessive-compulsive symptoms in parkinson's disease. Journal of Neurology, Neurosurgery and Psychiatry, 70(3), 394-6. Retrieved from http://search.proquest.com/docview/195719805?accountid=35619
To systematically investigate obsessive-compulsive traits in Parkinson's disease, patients were administered the Maudsley obsessional-compulsive inventory (MOCI) and a modification of the Leyton obsessional inventory (LOI) to a sample of non-demented and non-depressed patients with Parkinson's disease. Patients with severe Parkinson's disease showed more obsessive traits than normal controls in MOCI and LOI total scores, and in the "checking", "doubting", and "cleaning" subscales of the MOCI. By contrast, patients with mild disease did not differ from controls. A significant correlation was found between severity and duration of illness and MOCI total score. These results support the involvement of basal ganglia in obsessive-compulsive symptomatology. As patients with mild Parkinson's disease did not