This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Background and Rationale: Memory is impaired in Parkinson's Disease. Acetylcholine (ACh) is a neurotransmitter in the brain. ACh function is impaired in Parkinson's Disease. ACh is important for normal memory function. Like PD, ACh function is impaired in Alzheimer's disease where ACh treatment improves memory function. Thus, ACh treatment may improve memory in PD. Study Questions: Will administration of a drug that increases ACh levels in the brain improve memory and brain function in Parkinson's Disease? Design: Double-blind, placebo controlled study of 10mg Donepezil daily for 8 weeks. Study Population: Subjects with Parkinson's disease who are not demented. Outcome measures: 1. Brain function during a sequence learning memory task. Brain function will be measured by Positron Emission Tomography. 2. Multiple behavioral measures of memory including rate of new information acquisition, rate of retrieval of learned information, and rate of forgetting information.
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