We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThirty years on--a large anti-Flynn effect? (II): 13- and 14-year-olds. Piagetian tests of formal operations norms 1976-2006/7.AuthorsShayer M; Ginsburg DPublicationThe British journal of educational psychology, 2009, Vol 79, Issue Pt 3, p409ISSN0007-0998Publication typearticleDOI10.1348/978185408X383123