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Twin studies suggest the same genetic factors influence both brain size and intelligence. This has led to the hypothesis that genetics influence intelligence partly by contributing to the development of larger brains. We tested this hypothesis using four large imaging genetics studies (combined N = 7965) with polygenic scores derived from a genome-wide association study (GWAS) of educational attainment, a correlate of intelligence. We conducted meta-analysis to test associations among participants\u2019 genetics, total brain volume (i.e., brain size), and cognitive test performance. Consistent with previous findings, participants with higher polygenic scores achieved higher scores on cognitive tests, as did participants with larger brains. Participants with higher polygenic scores also had larger brains. We found some evidence that brain size partly mediated associations between participants\u2019 education polygenic scores and their cognitive test performance. Effect sizes were larger in the population-based samples than in the convenience-based samples. Recruitment and retention of population-representative samples should be a priority for neuroscience research. Findings suggest promise for studies integrating GWAS discoveries with brain imaging to understand neurobiology linking genetics with cognitive performance.<\/jats:p>","DOI":"10.1093\/cercor\/bhy219","type":"journal-article","created":{"date-parts":[[2018,8,17]],"date-time":"2018-08-17T15:25:52Z","timestamp":1534519552000},"page":"3496-3504","source":"Crossref","is-referenced-by-count":44,"title":["A Polygenic Score for Higher Educational Attainment is Associated with Larger Brains"],"prefix":"10.1093","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1083-6277","authenticated-orcid":false,"given":"Maxwell L","family":"Elliott","sequence":"first","affiliation":[{"name":"Department of Psychology & Neuroscience, Duke University, Box 104410, Durham, NC, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel W","family":"Belsky","sequence":"additional","affiliation":[{"name":"Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, USA"},{"name":"Social Science Research Institute, Duke University, Durham, NC, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kevin","family":"Anderson","sequence":"additional","affiliation":[{"name":"Department of Psychology, Yale University, New Haven, CT, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David L","family":"Corcoran","sequence":"additional","affiliation":[{"name":"Center for Genomic and Computational Biology, Duke University, Durham, NC, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tian","family":"Ge","sequence":"additional","affiliation":[{"name":"Athinoula A. 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