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The quantum logical `or' is analyzed from a physical perspective. We showthat it is the existence of EPR-like correlation states for the quantummechanical entity under consideration that make it nonequivalent to theclassical situation. Specifically, the presence of potentiality in thesecorrelation states gives rise to the quantum deviation from the classicallogical `or'. We show how this arises not only in the microworld, but also inmacroscopic situations where EPR-like correlation states are present. Weinvestigate how application of this analysis to concepts could alleviate somewell known problems in cognitive science.

Why the Disjunction in Quantum Logic is Not Classical