A paper suggests that context-induced violations of invariance in
preference and in similarity judgments are based on changes in the
underlying cognitive representation.  Using the case of attraction effect
as its example, it demonstrates experimentally that: 1.  similarity or the
distance between 2 brands changes as a function of new brand introduction,
and 2.  rather precise predictions can be made as to the pattern of
changes in the distance between brands and changes in preference ordering.
Furthermore, the effect of context on similarity judgment patterns allows
it to identify new effects on preference for previously untested location
of new brands, providing additional support for the claim that preference
and similarity judgments involve common processes.