Recent neurobiological evidence suggests that environmentally derived activ
ity plays a central role in regulating neuronal growth and neuronal connect
ivity. Artificial neural networks with distributed representations display
many features of knowing and learning that are known from biological intell
igence. In this article, I advocate artificial neural networks as models fo
r cognition and development. These models and how they work are exemplified
in the context of a well-known Piagetian developmental task and school sci
ence activity: balance beam problems. I conclude that artificial neural net
works, because of their profoundly interactivist nature, are ideal tools fo
r modeling cognitive development and learning in science. (C) 2000 John Wil
ey & Sons, Inc.