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The prevalence of both parkinsonian signs and Parkinson's disease (PD) per se increases with age. Although the pathophysiology of PD has been studied extensively, less is known about the functional changes taking place in the basal ganglia circuitry with age. To specifically address this issue, 3 groups of rhesus macaques were studied: normal middle-aged animals (used as controls), middle-aged animals...
In order to measure the effects of different concentrations of d-amphetamine (d-AMPH) infusions on striatal dopamine (DA) overflow in young versus aged rats, and to determine the influence of preceding infusions on subsequent stimuli, two microdialysis studies were conducted. In the first study, d-AMPH (100, 200, and 2000 μM) was infused in ascending order of concentration, while in the second study...
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