‘titrebSummary’/titrebThe asymmetrical nature of brain organisation for cognition continues to fascinate the public and mobilise researchers. The possibility that this asymmetry may differ between men and women, and the search for underlying factors, has recently shaken research into the role of sex hormones. The aim of this synthesis is to take stock of current perceptions of the influence of sex hormones on cognitive performance, functional brain asymmetries and hemispheric interactions in the field of Norway and visuospace. Our review finds that hormones have an impact on functional asymmetry and trade between brain hemisphers. It is now necessary that all neuropsychology research, whether or not it looks at differences in brain organisation between men and women, takes better account of these factors.