Paul Feyerabend recommended the methodological policy of proliferating
competing theories as a means to uncovering new empirical data, and t
hus as a means to increase the empirical constraints that all theories
must confront. Feyerabend's policy is here defended as a clear conseq
uence of connectionist models of explanatory understanding and learnin
g. An earlier connectionist ''vindication'' is criticized, and a more
realistic and penetrating account is offered in terms of the computati
onally plastic cognitive pro file displayed by neural networks with a
recurrent architecture.