We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleEffects of environmental complexity and training on brain chemistry.AuthorsKRECH, D; ROSENZWEIG, M R; BENNETT, E LPublicationJournal of comparative and physiological psychology, 1960, Vol 53, p509ISSN0021-9940Publication typeJournal ArticleDOI10.1037/h0045402