Rumelhart was the first author of a highly cited paper from 1985[4] (co-authored by Geoffrey Hinton and Ronald J. Williams) that applied the back-propagation algorithm to multi-layer neural networks. This work showed through experiments that such networks can learn useful internal representations of data. The approach has been widely used for basic cognition researches (e.g., memory, visual recognition) and practical applications. The 1985 paper does not cite earlier publications of backpropagation, such as the 1974 dissertation of Paul Werbos,[5] as they did not know the earlier publications.[6]
Rumelhart developed backpropagation around 1982 independently.[6] In 1983, he showed it to Terry Sejnowski, who tried it and found it to train much faster than Boltzmann machines (developed in 1983).[7] Geoffrey Hinton however did not accept backpropagation, preferring Boltzmann machines, only accepting backpropagation a year later.[8]
In the same year, Rumelhart also published Parallel Distributed Processing: Explorations in the Microstructure of Cognition[9] with James McClelland, which described their creation of computer simulations of perceptrons, giving to computer scientists their first testable models of neural processing, and which is now regarded as a central text in the field of cognitive science.[1]
His 1986 work with McClelland ignited the "past tense debate" during the 1980s revival of neural networks.[10] The connectionism side debated the symbolic side, represented by Jerry Fodor, Gary Marcus, Zenon Pylyshyn, Steven Pinker, etc. The debate concerned whether neural networks or symbolic programs were adequate models for how English speakers can turn a verb into its past tense.[11][12]
Rumelhart's models of semantic cognition and specific knowledge in a diversity of learned domains using initially non-hierarchical neuron-like processing units continue to interest scientists in the fields of artificial intelligence, anthropology, information science, and decision science.
^Rumelhart, D. E.; McClelland, J. L. (1986). "On learning the past tenses of English verbs"(PDF). Parallel distributed processing: explorations in the microstructure of cognition, vol. 2: psychological and biological models. Cambridge, MA, USA: MIT Press. pp. 216–271. ISBN978-0-262-13218-3. Retrieved 2023-11-03.
^Pinker, Steven. "Four decades of rules and associations, or whatever happened to the past tense debate." Language, the brain, and cognitive development: Papers in honor of Jacques Mehler (2001): 157-179.