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• W1966295605 startingPage "2144" @default.
• W1966295605 abstract "According to a widely held view, mesencephalic dopamine neurons mediate feedback-based learning by broadcasting an error signal that indexes the difference between anticipated and actual response-contingent reward. The present experiment tested whether impaired learning of a probabilistic classification task by individuals with Parkinson’s disease (PD) is associated with abnormal reward expectation. The stimulus-preceding negativity (SPN), a brain potential known to reflect anticipation of motivationally significant events, was compared for blocks in which subjects anticipated high or low monetary rewards and punishments. The SPN was reduced in amplitude in patients relative to controls in the high monetary incentive condition. Furthermore, whereas the SPN varied in size as a function of cue complexity for control subjects, it did not for patients. These results suggest that anticipatory processes within cortical portions of the reward system are impaired by PD. These data support previous claims that the SPN offers an electrophysiological index of activity within cortical portions of the reward pathway, and that reinforcement-based learning is impaired in PD." @default.
• W1966295605 created "2016-06-24" @default.
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• W1966295605 date "2006-10-01" @default.
• W1966295605 modified "2023-10-17" @default.
• W1966295605 title "Psychophysiological evidence for impaired reward anticipation in Parkinson’s disease" @default.
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• W1966295605 doi "https://doi.org/10.1016/j.clinph.2006.05.026" @default.
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