A representation of Rummelhart and McClelland’s early (1986) connectionist model of how a verb stem (such as “show”) can be related to production of the past tense form (“showed”) through weighted connections between two layers of neuron-like units. Reprinted with permission from RETHINKING INNATENESS: A CONNECTIONIST PERSPECTIVE ON DEVELOPMENT, edited by Jeffrey Elman, Elizabeth Bates, Mark H. Johnson, Annette Karmiloff-Smith, Domenico Parisi, and Kim Plunkett, published by MIT Press.