
In Cognitive Neuropsychology, data from case studies are used to create models, to draw conclusions about the functional characteristics of normal intellect, and to explore deficient and intact mental abilities. The results of case studies have become equally reliable data through which a theory is supported or not. Parkinson's disease is one of the most common neurodegenerative diseases with an average incidence of about 200 / 100,000. The frequency depends on age, as up to the age of 40 it does not exceed 3-4 / 100,000 while from the age of 70 onwards it exceeds 50 / 100,000. The present study examines the cognitive deficits of a 42-year-old woman diagnosed with Parkinson's disease.