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. Author manuscript; available in PMC: 2007 Apr 13.
Published in final edited form as: Neuropsychopharmacology. 2006 Mar 15;31(10):2264–2272. doi: 10.1038/sj.npp.1301055

Figure 1.

Figure 1

Median reaction time on the Cued-Reinforcement Reaction Time task for 90 and 10% reinforced trials in (a) ll and (b) ss volunteers under placebo (TRP + ) and tryptophan-depleted (TRP−) conditions (insets ‘reinforcement-related speeding’ (the difference in median reaction time between 90 and 10% probability of reinforcement conditions—RRS) for TRP + and TRP− conditions). The ss genotype group showed RRS following placebo, which was abolished following acute tryptophan depletion, while the ll genotype group showed the opposite pattern of response. *p<0.005. Points and bars represent mean values, error bars 1 SED.