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. Author manuscript; available in PMC: 2013 May 23.
Published in final edited form as: Neurosci Lett. 2010 Feb 25;473(3):208–211. doi: 10.1016/j.neulet.2010.02.048

Fig. 2.

Fig. 2

Male participants only. Low β indicates higher impulsivity. The effects of 5-HTTLPR genotype and acute tryptophan depletion (ATD) on impulsive response style (β) in healthy men. Individuals who had the S′/S′ genotype were more impulsive than individuals with the L/S′ genotype, who in turn were more impulsive than those with the L/L genotype (p = 0.033). Furthermore, the tryptophan depleted men (active) were more impulsive compared to sham depleted men(p = 0.023). The number of participants in each group is displayed on top of the bars, and the Whiskers indicate standard deviations.