Locus of control, depression, and quality of life in Parkinson's Disease.

People can attribute the source of control of events that involve them either to internal or external factors. Through this view, depression can be defined as a belief that one's own behavior is not effective. In case of chronic diseases, such as Parkinson's Disease, depression is more frequent than in the general population. The present study aimed to assess locus of control orientation and its relation with depression and quality of life in 30 patients with Parkinson's Disease. Results showed positive correlation between external locus orientation and depression and quality of life scores, and negative correlation between internal orientation and depression.