Nicholas Keynes Humphrey (born 27 March 1943) is an English neuropsychologist and writer whose work has focused on the evolution of consciousness and social intelligence. He carried out early research on visual perception after cortical damage in monkeys and collaborated with Lawrence Weiskrantz in research that led to the discovery of blindsight. He moved into ethology and, after doing fieldwork with mountain gorillas, was one of the first to formulate the social intelligence hypothesis. His more recent research, in collaboration especially with Daniel Dennett, has concentrated on the science and philosophy of phenomenal consciousness. His work builds towards a materialist theory of conscious experience in humans and animals, that explains it as a life-affirming illusion. These ideas, popularised in books including A History of the Mind (1992), Seeing Red (2006), Soul Dust (2011) and Sentience (2023), have had considerable impact but remain controversial. Humphrey has held academic posts at the University of Oxford, the University of Cambridge, The New School for Social Research in New York, and the London School of Economics. He has presented television series on the development of the human mind and topics such as nuclear disarmament and belief in the supernatural.
Family and early life Humphrey was born in London, into what The New Yorker described as "an illustrious family of intellectuals". His father, John H. Humphrey, was a pioneering immunologist and his mother, Janet Humphrey (née Hill), a psychoanalyst who worked with Anna Freud. His paternal grandfather was the inventor H. A. Humphrey, and his great-aunt Edith Humphrey the first British woman to receive a doctorate in chemistry. His maternal grandparents were the Nobel-Prize winning physiologist, A. V. Hill (later, member of parliament for Cambridge University), and the welfare pioneer Margaret Hill, sister of economist John Maynard Keynes. Humphrey described the "family affair" of science in the 2004 book Curious Minds. "I grew up feeling I carried a warrant to explore anything I chose, that I could indeed safely cross into areas "Not for Everybody.""
Education Humphrey attended a boarding prep school and Westminster School (1956–61) He acted in school plays, including Shakespeare and Euripides (in Greek). He read widely and kept a commonplace book, which he maintained into later life. At Westminster, he and his physics teacher designed an experiment to measure the speed of light using equipment set up along a London street. In his autobiography, Stephen Hawking recalls that in 1958, when he was sixteen and his family went to India for a year, he "stayed with the family of Dr. John Humphrey at their house in Mill Hill. The house had a basement that contained steam engines and other models made by John Humphrey’s father.". Humphrey (two years younger) recalls him as "quizzical" and "somewhat bossy". In 1961 Humphrey went up to Trinity College, Cambridge on a scholarship, initially to read mathematics and physics. But he soon switched to physiology and psychology. His physiology tutor, Giles Brindley, introduced him to experimental neuroscience in dramatic fashion: Humphrey encountered Brindley standing in a salt bath, wearing a helmet from which a metal rod projected against his right eye, through which Brindley was passing electric current to his retina to study phosphenes, inspired by an experiment of Isaac Newton in the 1660s. While an undergraduate, Humphrey edited with John Barrell the literary magazine Granta, the only scientist in the history of the magazine to do so.
Academic career
Cambridge and blindsight Humphrey's doctoral research at Cambridge was notable for his pioneering study of a rhesus monkey, Helen, whose primary visual cortex had been surgically removed by his supervisor Lawrence Weiskrantz. When Humphrey first encountered Helen, she appeared to be completely blind. But, on a hunch that she might still be capable of using the subcortical mid-brain visual system, he decided to try new methods of "teaching her to see". He quickly established that she was capable of much more than anyone expected. He went on to work with this monkey for the next seven years (taking her with him to Oxford and then back to Cambridge). Her vision improved so far that eventually she was able to run around an arena, deftly avoiding obstacles, picking up tiny currants from the floor. When Humphrey and Daniel Dennett showed a film of Helen at a seminar of psychologists and philosophers "nobody guessed the truth: Helen was cortically blind." The findings with Helen encouraged Weiskrantz to investigate comparable phenomena in humans. Working with a patient known as D.B., who was blind in part of his visual field following brain damage, Weiskrantz and colleagues showed that D.B. could accurately "guess" the location of stimuli despite reporting no visual awareness. They termed this capacity blindsight, a dissociation between visual performance and conscious experience that has become central to contemporary research on consciousness. The explanation of blindsight remains contested, with some critics claiming it is merely “degraded” normal vision. Humphrey himself characterizes it as perception without sensation. In a 2025 paper he has argued that blindsight is not strictly “unconscious”: rather it is a case of cognitive consciousness in the absence of phenomenal consciousness, i.e. “insentient vision”; and he suggested it is a return to an evolutionarily primitive stage, “the vision of fish and frogs”
Oxford and evolutionary aesthetics After completing his doctorate, Humphrey became Lecturer in Psychology at the University of Oxford in 1967. There he investigated visual and colour preferences in monkeys and developed an evolutionary account of aesthetic response, based around the cognitive appeal of “rhyme”. His essay "The Illusion of Beauty", based on this work, was broadcast on BBC Radio and won the Glaxo Science Writers Prize in 1980. 50 years later he has returned to this theme in a book to be published in October 2026, "Why is the World so Beautiful?: Our Minds in Search of Nature's Rhymes"
… excerpt ends here. Continue reading the full article.
