Cognitive and emotional processing associated with the Season of Birth and dopamine D4 receptor gene

▶ Winter-borns with the 7R DRD4 variant have increased behavioral approach to reward. ▶ They present with increased risk taking in the Iowa Gambling Task. ▶ They do not differ from summer-born/7R or 4R subjects in planning for problem solving. ▶ Season of Birth modifies the behavioral expression of the DRD4 VNTR polymorphism.