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Seamans JK, Durstewitz D, Christie BR, Stevens CF, Sejnowski TJ.Seamans JK, et al.Proc Natl Acad Sci U S A. 2001 Jan 2;98(1):301-6. doi: 10.1073/pnas.98.1.301.Proc Natl Acad Sci U S A. 2001.PMID: 11134516Free PMC article.