It’s not just a movement disorder. Besides causing tremors and other motion-related symptoms, Parkinson’s disease affects memory, learning, and behavior.

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This is a general term used to refer to an individual who participates in a research study. Currently, many researchers prefer to use the term "participant". Before participating in any research study, all subjects must be informed of the goal of the study and the exact procedure they will undergo, and must give their free consent to participate.