Based only on the text delimited by triple quotes answer the question "Has NAME_1 contributed to the field of deep learning?" ``` There are two types of neural networks: feedforward neural networks (FNNs) and recurrent neural networks (RNNs). RNNs have cycles in their connectivity structure, FNNs don't. In the 1920s, NAME_2 and NAME_3 created and analyzed the Ising model[27] which is essentially a non-learning RNN architecture consisting of neuron-like threshold elements. In 1972, NAME_4 made this architecture adaptive.[28][29] His learning RNN was popularised by NAME_5 in 1982.[30] RNNs have become central for speech recognition and language processing.

NAME_6 writes that NAME_7 developed and explored all of the basic ingredients of the deep learning systems of today,[31] referring to NAME_1's 1962 book[32] which introduced a multilayer perceptron (MLP) with 3 layers: an input layer, a hidden layer with randomized weights that did not learn, and an output layer.[29] However, since only the output layer had learning connections, this was not yet deep learning. It was what later was called an extreme learning machine.[29] ```  Provide your response in exactly 3 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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