robot called Cora (Conditional Reflex Analogue), which was designed to learn how to associate a whistle with a light, inspired by Ivan Pavlov’s experiments with dogs that were trained to salivate at the sound of a bell. Although Cora started life as a robot much like Elmer and Elsie, eventually Grey Walter performed ‘surgery’ and removed the specific learning circuits so he could study this part of the electronic brain on its own.