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Reward pathways in Parkinson's disease: Clinical and theoretical implications

Aims:  The mesolimbic and mesocortical circuits are particularly involved in reward‐related behavior in humans. Because these systems may be in some way altered in Parkinson's disease (PD), it is likely that some psychiatric manifestations of PD, such as hedonistic homeostatic dysregulation and pathological gambling, as well as impulsive decision making, may be ascribed to their involvement. The aim of the current article was to review recent literature on this topic in order to analyze whether these disturbances share a common ground and whether actual theoretical frameworks on addiction prove a useful tool for their interpretation.