Visual memory of black and white male heroin and nonheroin drug users.
D000328:Adult; D005006:Ethnicity / Q000523:psychology*; D006556:Heroin Dependence / Q000523:psychology*; D006801:Humans; D008297:Male; D008568:Memory / Q000187:drug effects*; D011939:Mental Recall / Q000187:drug effects*; D019966:Substance-Related Disorders / Q000523:psychology; D014796:Visual Perception / Q000187:drug effects*