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Quantum probability and conceptual combination in conjunctions

  • James A. Hampton (a1)


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.



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Hampton, J. A. (1987) Inheritance of attributes in natural concept conjunctions. Memory & Cognition 15:5571.
Hampton, J. A. (1988b) Overextension of conjunctive concepts: Evidence for a unitary model for concept typicality and class inclusion. Journal of Experimental Psychology: Learning, Memory, and Cognition 14:1232.
Hampton, J. A. (1997) Emergent attributes in conceptual combinations. In: Creative thought: An investigation of conceptual structures and processes, ed. Ward, T. B., Smith, S. M. & Viad, J., pp. 83110. American Psychological Association Press.
Hampton, J. A. (2012) Thinking intuitively: The rich (and at times illogical) world of concepts. Current directions in psychological science 21:398402.
Osherson, D. & Smith, E. (1981) On the adequacy of prototype theory as a theory of concepts. Cognition 9:3558.
Storms, G., De Boeck, P., van Mechelen, I. & Ruts, W. (2005) Not guppies, nor goldfish, but tumble dryers, Noriega, Jesse Jackson, panties, car crashes, bird books, and Stevie Wonder. Memory & Cognition 26:143–45.
Tversky, A. & Kahneman, D. (1983) Extensional versus intuitive reasoning: The conjunction fallacy in probability judgment. Psychological Review 90(4): 293315.

Quantum probability and conceptual combination in conjunctions

  • James A. Hampton (a1)


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