Why the disjunction in quantum logic is not classical

In this paper, the quantum logical "or" is analyzed from a physical perspec tive. We show that it is the existence of EPR-like correlation states for t he quantum mechanical entity under consideration that make it nonequivalent to the classical situation. Specifically, the presence of potentially in t hese correlation states gives rise to the quantum deviation from the classi cal logical "or". We show how this arises not only in the microworld, but a lso in macroscopic situations where EPR-like correlation states are present . We investigate how application of this analysis to concepts could allevia te some well known problems in cognitive science.