Bristol and a pioneer of the electroencephalograph (EEG machine) was one of the scientists who tried to understand intelligence in this new optimistic environment. After his experience in studying the human brain using the EEG, he had an idea. Instead of just studying brains, perhaps if you could make a brain then you could understand it better.
Grey Walter used pieces of old alarm clocks and army surplus materials to build two mechanical tortoises called Elmer and Elsie: autonomous battery-operated robots that used a rotating light sensor on the top to detect bright lights and move towards them. They also had touch sensors on the body so that if they bumped into an obstacle they would move away from it. Grey Walter likened their brains to two sensory neurons: one for light, one for touch. Surprisingly, despite such minimal brains, he discovered they