  This article is an exploratory account of the the non-monotonic behaviour of
conceptual associations in the light of context. Computational approximations
of conceptual space are furnished by semantic space models which are emerging
from the fields of cognition and computational linguistics. Semantic space
models not only provide a cognitively motivated basis to underpin human
practical reasoning, but from a mathematical perspective, they are real-valued
Hilbert spaces. This introduces the highly speculative prospect of formalizing
aspects of human practical reasoning via quantum mechanics. This account
focuses on how to formalize context effects in relation to concepts as well as
keeping an eye on operational issues.
