Twelve Danish pairs of uniovular twins brought up apart were studied individually using the 1938 version of Raven's Progressive Matrices. Significant within‐pair correlations were found for raw scores and solving time pointing to a considerable influence of hereditary factors on such test performances.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.