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Response Times (RT) in a Cued Letter Discrimination Task. NOTE: (a) RT plotted as a function of CHRNA4 genotype (group sample sizes: T/T n= 63; T/C n= 25; C/C n= 18) for costs of invalid cues (Invalid – Neutral RT) and benefits of valid cues (Neutral – Valid RT); (b) RT plotted as a function of cue validity and DBH genotype (group sample sizes: G/G n= 18; G/A n= 33; A/A n= 13).
