We present a theoretical account of implicit and explicit learning in terms
of ACT-R,an integrated architecture of human cognition as a computational
supplement to Dienes & Perner's conceptual analysis of knowledge. Explicit
learning is explained in ACT-R by the acquisition of new symbolic knowledge
, whereas implicit learning amounts to statistically adjusting subsymbolic
quantities associated with that knowledge. We discuss the common foundation
of a set of models that are able to explain data gathered in several signa
ture paradigms of implicit learning.