To study the influence of depression on executive functioning in patients with Advanced Idiopathic Parkinson's Disease without Dementia (IPD without dementia), Hoehn and Yahr stages III and IV. Parkinson's Disease (PD) is a neurodegenerative pathology characterized by symptoms such as bradykinesia, rigidity, instability and postural tremor. It affects basic, instrumental and advanced activities of daily living, affecting the deterioration of individual, social and family quality of life.