Assertion: dopamine's role | /r/HasProperty | causal
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Source sentences:
text: We predicted that if dopamine, beyond its role in learning and motivation, plays a causal role in music-evoked pleasure, levodopa and risperidone administration should lead to opposite effects in measures of both musical pleasure and motivation: while the dopamine precursor levodopa should increase the hedonic experience and the music-related motivational responses, risperidone should lead to a reduction of both.