Machina speculatrix

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Grey Walter’s most well-known work was his construction of some of the first electronic autonomous robots.[3] He wanted to prove that rich connections between a small number of brain cells could give rise to very complex behaviors - essentially that the secret of how the brain worked lay in how it was wired up. His first robots, which he used to call Machina speculatrix[4] and named Elmer and Elsie, were constructed between 1948 and 1949 and were often described as tortoises[5] due to their shape and slow rate of movement - and because they “taught us” about the secrets of organisation and life. The three-wheeled tortoise robots were capable of phototaxis, by which they could find their way to a recharging station when they ran low on battery power.

In one experiment, Walter placed a light on the “nose” of a tortoise and watched as the robot observed itself in a mirror. “It began flickering,” he wrote. “Twittering, and jigging like a clumsy Narcissus.”[citation needed] Walter argued that if it were seen in an animal it “might be accepted as evidence of some degree of self-awareness.”

One of the tortoises was modified, (given the pretend scientific name Machina docilis) and had added to its simple single celled “brain” one, then two conditional reflex circuits in which they could be taught simple behaviors similar to Ivan Pavlov’s dogs.[citation needed] This tortoise was called CORA. One of these included being hit meant food whilst whistling means food, and when conditioned such a whistle by itself means being hit. When he added another circuit tuned to a whistle of another pitch, this could become whistle means being hit, whistle means food, this would make the animal become “afraid” whenever food was presented. Walter remedied this behaviour by severing the two additional circuits, and the tortoise reverted to being a Machina speculatrix. The conditioned reflex behaviour was later placed into a static desktop model, also known as CORA.

Later versions of Machina speculatrix were exhibited at the Festival of Britain in 1951. Walter stressed the importance of using purely analogue electronics to simulate brain processes at a time when his contemporaries such as Alan Turing and John von Neumann were all turning towards a view of mental processes in terms of digital computation. His work inspired subsequent generations of robotics researchers, including Rodney Brooks, Hans Moravec and Mark Tilden.[citation needed] Modern incarnations of Walter’s turtles may be found in the form of BEAM robotics.

In 2000, an original tortoise went on display in London, UK, in the Science Museum.[6] Recently,[when?] one was also replicated by Dr Owen Holland, of the University of the West of England in 1995, using some of the original parts. An original tortoise as seen at the Festival of Britain is in the collection of the Smithsonian Institution.

Walter’s papers including his letters, photographs and press cuttings form part of the Burden archive held at the Science Museum Library & Archives in Wroughton Science Museum at Wroughton.