Neural networks received relatively scant attention from cognitive scientists during the 1960s and 1970s, when Turing-style models dominated. The 1980s witnessed a huge resurgence of interest in neural networks, especially analog neural networks, with the two-volume Parallel Distributed Processing (Rumelhart, McClelland, and the PDP research group, 1986; McClelland, Rumelhart, and the PDP research group, 1987) serving as a manifesto.  Researchers constructed connectionist models of diverse phenomena: object recognition, speech perception, sentence comprehension, cognitive development, and so on. Impressed by connectionism, many researchers concluded that CCTM+RTM was no longer “the only game in town”.