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The effect of COMT inhibition on delayed, rewarded alternation. Performance (percentage of correct trials; means ± SEMs of 20 trials) at 30 and 600 second delays in vehicle- (open circles, dotted line; n = 8) and tolcapone-treated (closed triangles, dashed line; n = 8) rats, and non-injected controls (open diamonds, solid line; n = 8). The dashed line indicates chance performance (50% correct). **p<0.01.
