(1910-1977), neurophysiologist William Grey Walter (also known as Grey Walter) was born in Kansas City, Missouri, on 19 February 1910 to journalist parents Karl Wilhelm Walter (1880-1965) and Minerva (Margaret) Lucrezia Hardy (1879-1953). The Walter family moved from the United States to Britain in 1915, where William remained for the rest of his life. He was educated at Westminster School (1922-1928), before taking the Natural Science Tripos at King’s College, Cambridge (1928-1931). He went on to pursue postgraduate research on nerve physiology and conditioned reflexes, gaining his MA in 1935. After completing his MA, Walter was invited to work at the Central Pathological Laboratory of the Maudsley Hospital, London, under neuropsychiatrist Frederick Lucien Golla (1877-1968). Since the late 1920s, Golla had become increasingly interested in the clinical applications of the burgeoning field of electroencephalography (EEG), the measurement of the electrical activity of the brain via electrodes placed on the scalp. Noting his skill in technical matters, Golla encouraged Walter to develop increasingly sophisticated EEG devices, and supported his application for a Rockefeller Travelling Fellowship to visit the Jena laboratory of German physiologist Hans Berger (1873-1941), widely credited as the founder of electroencephalography. Walter went on to achieve several key ‘firsts’ in electroencephalography, including the first detection of a cerebral tumour using the technique in 1936. Between 1936 and 1939, Walter expanded his research programme and took readings from hundreds of patients, focusing particularly on the electrical patterns of epilepsy. In 1939, Golla was invited to become director of the new Burden Neurological Institute, Bristol, an independent research unit specialising in the investigation and treatment of neurological, psychological, and psychiatric disorders, and invited Walter to become director of the Institute’s Physiology Department. At the Burden, Walter further developed his EEG apparatus, developing the automatic frequency analyser and the toposcope in 1943 and 1950 respectively. His research programme also became increasingly ambitious, with investigations into the cerebral effects of stroboscopic light beginning in 1947 and, later, the discovery of ‘contingent negative variation’ (CNV, or the ‘expectancy wave’) in the 1960s. Walter also played a key role in the professionalization of electroencephalography during this period, co-founding the journal Electroencephalography and Clinical Neurophysiology and organising meetings of the EEG Society (1943-1989). Outside of his clinical work, Walter became a key figure in early British cybernetics, the study of feedback, control, and communication systems in humans and machines that synthesised approaches from engineering, biology, and mathematics. He co-founded the Ratio Club, an informal dining and discussion group which provided a key social outlet for cybernetic enthusiasts, which met between 1949 and 1955. He also built several cybernetic devices in his spare time, the most famous of which were his robotic tortoises, or Machina Speculatrix, designed to function as simple models of the adaptable human brain. These received national attention when they were exhibited on television in 1950 and at the Festival of Britain in 1951. He also became a prolific public intellectual, writing 170 scientific publications, serving as an expert witness in court courses, appearing frequently on the BBC, and writing an immensely popular non-specialist text on his neuroscientific work, The Living Brain (1953). His work also gained a surprising popularity among counter-cultural artists during the 1950s and 1960s, including Beat writers William S. Burroughs and Allen Ginsberg, who saw Walter’s research as part of a broader investigation of human consciousness. Walter was married twice, first to Katharine Monica Ratcliffe in 1934 and then to Vivian Joan Dovey (1915-1980) in 1947, with whom he had one son, Timothy Walter (1949-1976). Walter and Dovey separated in 1960 and divorced in 1973. After their separation, Walter lived with Lorraine Josephine Aldridge (née Donn) until 1972. In 1970, Walter suffered severe brain damage following a road accident, forcing him to retire from full-time research work. He died of a heart attack in 1977.

(1895-1971), neurologist Semion Alexandrovich Sarkisov was born in Nagorno-Karabakh, Azerbaijan in 1895. After serving in the Red Army during the Soviet-Georgian War in 1921, Sarkisov pursued a medical degree at First Moscow State Medical University, qualifying in 1923. He subsequently joined the University’s Neurological Clinic under the tutelage of Professor Grigorij Rossolimo (1860-1928), before taking up a research scholarship at the Neurobiological Institute of Berlin under Professor Oskar Vogt (1870-1959). He returned to Moscow in 1927 and became the head of the Moscow Brain Institute a year later, a position he retained until his retirement in 1968. During his forty-year career, Sarkisov conducted a range of investigations into the physiology and chemistry of the human brain, focusing particularly on the evolution of the cerebral cortex. He also played a key role in establishing the field of electroencephalography (EEG, the measurement of the electrical activity of the brain) in Russia, founding the Moscow Brain Institute’s Electroencephalographic Laboratory in the 1930s. The Laboratory facilitated a number of international exchanges with EEG experts in the following decades, including those at the Burden Neurological Institute in Bristol, England. These connections proliferated when Sarkisov became a representative of the Soviet Red Cross in Britain during the Second World War. Sarkisov died on 13 December 1971 following a long illness.

The Burden Neurological Institute (BNI) is an independently-funded research unit and registered charity specialising in the investigation and treatment of neurological, psychological, and psychiatric disorders. The BNI opened in 1939 at the Stoke Park Colony in Bristol, England. The BNI was named after philanthropist Rosa Gladys Burden (1891-1939). Burden’s husband, Reverend Harold Nelson Burden (1859-1930), founded the Stoke Park Colony with his first wife Katherine Mary Burden (1856-1919) in 1909. The Colony became the first certified institution for the care of individuals with mental disorders in Britain following the passing of the 1913 Mental Deficiency Act. After Harold Burden’s death in 1930, Rosa continued his sponsorship of medical research by founding the Burden Research Trust in 1933, a £10,000 research fund to support medical and psychiatric studies of the Colony’s patients. In 1936, the Trust built a dedicated epilepsy clinic on site with a fully-fitted operating theatre, two small wards, and several laboratories. The clinic was officially opened on 12 May 1939 as the Burden Neurological Institute, under the directorship of neuropsychiatrist Frederick Lucien Golla (1878-1968). The BNI’s work was soon disrupted by the outbreak of the Second World War in September 1939. Throughout the conflict, the site was used as a neurosurgical hospital by the Emergency Medical Service (1938-1945), a state-run network of free hospital services organised by the Ministry of Health. Despite these duties, the laboratories remained open and research projects continued, such as a programme of electroencephalographic (EEG) research on war casualties who had sustained head injuries. Following the end of the war and the establishment of the National Health Service (NHS) in 1948, Golla fought to keep the BNI independent to ensure that researchers could continue to choose their own projects. The BNI did, however, provide neurophysiological services for nearby hospitals for an annual fee. From its foundation, the BNI took a leading role in the development of neurological and psychiatric expertise in Britain. Researchers at the BNI carried out the country’s first trial of electro-convulsive therapy (ECT) in 1939, closely followed by the first prefrontal leucotomy in 1940. The BNI also established itself as a centre of innovation in engineering, cybernetics, and early robotics during the post-war years, due in great part to the work of neurophysiologist William Grey Walter (1910-1977). Walter’s best-known inventions, his Machina Speculatrix (small robotic tortoises designed to model the basic functions of the human brain) attracted national attention, appearing in newspapers, on television, and at the Festival of Britain in 1951. After several years of financial uncertainty, the Trustees of the Burden estate sold the Stoke Park site to the Ministry of Health in 1968. While clinical work continued under the NHS at the newly constituted Burden Neurological Hospital, the Institute’s scientific researchers decided to remain separate, turning the BNI into a Company Limited by Guarantee in 1970. In 2000, the BNI moved its headquarters to the Rosa Burden Centre at Southmead Hospital, Bristol, following the final closure of the Stoke Park site in the late 1990s.