title: Quantum probability and conceptual combination in conjunctions.
abstract: I consider the general problem of category conjunctions in the light of Pothos & Busemeyer (P&B)'s quantum probability (QP) account of the conjunction fallacy. I argue that their account as presented cannot capture the "guppy effect" - the case in which a class is a better member of a conjunction A^B than it is of either A or B alone.
authors.affiliation: Department of Psychology, City University London, City University, Northampton Square, London EC1V OHB, United Kingdom. Hampton@city.ac.uk
authors.forename: James A
authors.initials: JA
authors.lastname: Hampton
mesh_terms: D003071:Cognition; D006801:Humans; D008960:Models, Psychological; D011338:Probability Theory; D011789:Quantum Theory