Adaptive systems of logic networks and binary memories

Various adaptive circuit schemes have been suggested since the early proposals by Ashby, McCulloch and Pitts, Rosenblatt, and many others. The way in which these schemes were investigated can be divided into three general classes. Firstly, and predominantly, there is simulation by a digital computer; secondly, we find the use of adaptive threshold elements such as Widrow's 'adaline'; and finally there are techniques which are realizable by conventional logic and memory circuitry such as Andreae's 'Stella' concept, Vernot's tunnel diode nets, and systems of the 'Artron' type.