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[–]SoylentCapitalist[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Are there any other lines of evidence that point to higher impulsivity among blacks?

Yes,

European Americans had higher initial levels of (β = 0.22, p < .001) and greater growth in sensation seeking (β = 0.16, p < .05) compared to African Americans. However, African American children had higher initial levels of impulsivity compared to European American children (βs = −0.27 and −0.16, p < .01).

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463755/