We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleNatural concepts in pigeons.AuthorsHerrnstein, R. J.; Loveland, Donald H.; Cable, CynthiaPublicationJournal of Experimental Psychology: Animal Learning and Cognition, 1976, Vol 2, Issue 4, p285ISSN0097-7403Publication typearticleDOI10.1037/0097-7403.2.4.285