Autonomous electronic machines known as tortoises first navigated laboratory floors between 1948 and 1949, demonstrating that complex behavioral patterns could emerge from simple neural circuitry. Designed by William Grey Walter, these three-wheeled inventions utilized phototaxis to locate power sources independently, fundamentally challenging contemporary understandings of how interconnected biological components facilitate animal-like responses and rudimentary forms of self-awareness.
Early Development and Academic Foundation
Born in Kansas City in 1910, Walter moved to Britain during the First World War. He attended Westminster School before entering King's College, Cambridge, in 1928, where he completed a first class in physiology in 1931. Following his education, he shifted his focus to applied neurophysiological research, working in various London hospitals before joining the Burden Neurological Institute in Bristol in 1939.
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Influenced by the work of Ivan Pavlov and Hans Berger, Walter developed advanced versions of the electroencephalograph. At the Burden Neurological Institute, he pioneered techniques to locate tumors and epileptic lesions using delta waves. He also achieved the first triangulation of alpha waves within the occipital lobe. During the 1960s, he identified the contingent negative variation, a brain activity spike occurring before conscious movement.
Pioneering Autonomous Robotics
Walter rejected the growing reliance on digital computation, advocating for analogue electronics to simulate neurological functions. His robotic tortoises, Elmer and Elsie, functioned as proof-of-concept for his theories on behavior. By adding conditional reflex circuits to create the CORA model, he successfully demonstrated how robots could mirror simple learning behaviors, including conditioned responses to sound and touch, often cited as early research in cybernetics.
Legacy and Archive
His research, including contributions to radar technology during the Second World War, established a foundation for modern BEAM robotics. Walter received an honorary doctorate from the University of Aix-Marseille in 1954. After suffering a brain injury in a 1970 scooter accident, he died in Clifton in 1977. His papers are preserved within the Burden archive at the Science Museum Library and Archives.
Fast facts
- Born: 1910, Kansas City
- Died: 1977, Clifton
- Education: Westminster School, King's College
- Primary Field: Neurophysiology
- Notable Invention: Machina speculatrix
- Honorary Degree: University of Aix-Marseille (1954)
- Citizenship: United Kingdom
Questions readers ask
What did the tortoise robots actually do?
They were three-wheeled, light-sensitive machines that could navigate to a recharging station when their batteries were low.
Did Walter believe robots could think?
He argued that complex behavior arising from simple circuits could be interpreted as evidence of self-awareness in an animal.
Achievements
- Educated at King's College and Westminster School
- Worked as neurobiologist, roboticist and computer scientist
