In this paper I shall compare two models of concept formation, both in
spired by basic convictions of philosophical empiricism. The first, th
e connectionist model, will be exemplified by Kohonen maps, and the se
cond will be my own dynamic theory of concept formation. Both can be u
nderstood in probabilistic terms, both use a notion of convergence or
stabilization in modelling how concepts are built up. Both admit desta
bilization of concepts and conceptual change. Both do not use a notion
of representation in some pre-given language, such as a language of t
hought or some logical language. Representation in a formal language o
nly plays a role on the meta-level, namely within the theory about con
cept formation.