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In addition, there is a growing appreciation that different classes of addictive substances are likely to lead to qualitatively different types of SUDs requiring differing treatment and relapse prevention strategies to be most effectively managed. Biological temperament, particularly on the internalizing \u2013 externalizing axis, is well established to influence addiction susceptibility. Externalizing behavior has long been understood to predispose individuals to addiction through novelty-seeking, sensation-seeking and impulsivity, while internalizing behavior provides an alternate pathway into addiction via increased occurrence of comorbid disorders (anxiety, depression). Here, we utilize a selectively bred rat model of internalizing vs externalizing temperament (bred High Responders, representing genetically mediated externalizing behavior and bred Low Responders, representing internalizing behavior) to examine differences in the acquisition of self-administration of the prototypical psychostimulant cocaine and the prototypical opioid heroin (diacetylmorphine). We found that, as predicted, cocaine and heroin drove different patterns of acquisition in the two different bred lines of rats. Further, this was influenced by temperament in complex ways. Notably, in females the \u201ctelescoping effect\u201d for opioid addiction-like behavior was primarily specific to externalizing temperament. These findings highlight the impact and interaction of many factors, including drug class, temperament, and sex, on the acquisition of drug-taking behavior. Additionally, these findings indicate that sex differences in addiction vulnerability may be influenced in part by biological temperament.<\/jats:p>","DOI":"10.64898\/2026.04.09.717453","type":"posted-content","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T17:50:19Z","timestamp":1776102619000},"source":"Crossref","is-referenced-by-count":0,"title":["Differential acquisition of cocaine and heroin self-administration in a rat model of internalizing versus externalizing temperament"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8587-4115","authenticated-orcid":false,"given":"M.A.","family":"Emery","sequence":"first","affiliation":[{"name":"Michigan Neuroscience Institute, University of Michigan."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Parsegian","sequence":"additional","affiliation":[{"name":"Michigan Neuroscience Institute, University of 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