849
In contrast to this D1 modulated speeding in reward - motor tasks , evidence from saccade tasks in non - human primates suggests D2 receptor modulation of reward dependent improvements of performance ( Nakamura and Hikosaka , 2006 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
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