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Effects of D-amphetamine (5.0 μg/ 0.5 μl), microinjected bilaterally in nucleus accumbens medial shell in the presence and absence of 1-NASPM (25.0 μg), on two measures of threshold (left x-axis intercept; right M-50) in the curve-shift protocol of LHSS. n=9 per group. *p<.05, **p<.01, ***p<.005
