Donald Hoffman
Donald Hoffman (Donald D. Hoffman) is an American cognitive scientist and professor of cognitive sciences at UC Irvine who has long studied visual perception and consciousness; he proposed the “interface theory of perception” and the “fitness beats truth” theorem, arguing that perceptions shaped by evolution do not show objective reality, and wrote The Case Against Reality, ideas that have drawn wide attention as well as criticism from philosophers.
Contents15 sections
Key facts
December 29, 1955Born in San Antonio, Texas
Hoffman was born on December 29, 1955, in San Antonio, Texas, to David Pollock Hoffman and Loretta Virginia Hoffman.[1]
He recalls that his father was a minister and that as a teenager he wanted to know whether humans are machines.[2]
1983Earns MIT PhD and Joins UC Irvine
He earned a UCLA BA in 1978 and was a project engineer at Hughes Aircraft until 1983. That year he earned an MIT PhD and became an assistant professor of cognitive science at UC Irvine, becoming a full professor in 1990 and also a professor of philosophy from 1996.[3]
1986Marries Geralyn M. Souza
In 1986 he married Geralyn M. Souza; he has a daughter from a previous marriage.[1]
1989–1994Wins APA and National Academy of Sciences Awards
In 1989 he received the American Psychological Association’s Distinguished Scientific Award and published the co-authored Observer Mechanics: A Formal Theory of Perception; in 1994 he received the National Academy of Sciences’ Troland Research Award.[3]
1998Publishes Visual Intelligence
In 1998 he published Visual Intelligence: How We Create What We See, explaining how vision organizes and adds information to construct a world.[1]
March 2015Gives TED Talk
In March 2015 he gave the TED talk “Do we see reality as it is?”, which soon passed 2 million views. He and collaborators ran evolutionary simulations with different fitness functions, in which perceptual strategies unrelated to reality almost always won.[4]
April 2016Explains His Evolution-and-Perception Theorem
In April 2016 he said Chetan Prakash had proved his theorem that an organism seeing reality as it is is never more fit than one of equal complexity tuned only to fitness. He likened perception to desktop icons hiding a complex reality and proposed “conscious realism.”[2]
August 2019Publishes The Case Against Reality
In August 2019 he published The Case Against Reality: Why Evolution Hid the Truth from Our Eyes, setting out the fitness-beats-truth theorem and the interface theory of perception and arguing that human perceptions retain only what is needed for survival and reproduction. A Psychology Today review called his arguments “consistently well reasoned.”[5]
June 12, 2022Appears on the Lex Fridman Podcast
On June 12, 2022, he appeared on episode 293 of the Lex FridmanLex FridmanLex Fridman is a Soviet-born, US-raised computer scientist and podcast host who works as an MIT research scientist on human-AI interaction and autonomous driving. His Lex Fridman Podcast is known for hours-long conversations with guests including heads of state and technology leaders.Open the full entry Podcast, introduced as a UC Irvine cognitive scientist and author of The Case Against Reality, discussing spacetime, reductionism, evolutionary game theory, consciousness and other topics.[6]
January 9, 2023Publishes “Fusions of Consciousness”
On January 9, 2023, he, Chetan Prakash and Robert Prentner published “Fusions of Consciousness” in Entropy, assuming that subjects and experiences lie beyond spacetime, describing the dynamics of conscious agents with Markov chains, and proposing that particles in spacetime are projections of conscious agents’ interactions.[7]
February 2023Philosopher Raymond Tallis Publishes a Critique
The philosopher Raymond Tallis wrote in Philosophy Now that Hoffman’s theory exemplifies “Radical Darwinitis”: because evolutionary theory presupposes real organisms existing in space and time, using it to deny spacetime and objective objects is self-refuting.[8]
February 2026Comments on Whether AI Can Be Conscious
In February 2026, discussing whether machines could love, he said no one has any clue how to get a specific conscious experience out of AI—“we don’t know how to start”—and that experiences such as love do not necessarily originate in the brain’s circuitry.[9]
As of October 2026: Research and Public Profile
He has written more than 120 scientific papers, his writing has appeared in Scientific American, New Scientist and elsewhere, and his work has been featured in Wired, The Atlantic and the TV series Through the Wormhole with Morgan Freeman.[10]
His research has been funded by the National Science Foundation, the Office of Naval Research, the Faggin Foundation and others; he continues to develop a mathematical model of consciousness and has applied it to the “combination problem” of consciousness.[11]
Related Organizations, Websites, and Public Accounts
Personal website: Public link: https://sites.socsci.uci.edu/~ddhoff/ (opens in a new window)[6]
X: Public account: https://x.com/donalddhoffman (opens in a new window)[6]
University of California, Irvine: Official website: https://uci.edu/ (opens in a new window)[10]
Sources
- Hoffman, Donald D. 1955– | Encyclopedia.com (opens in a new window)
- The Evolutionary Argument Against Reality | Quanta Magazine (opens in a new window)
- VITA (opens in a new window)
- What If Evolution Bred Reality Out Of Us? : 13.7: Cosmos And Culture : NPR (opens in a new window)
- Believe Nothing You See | Psychology Today (opens in a new window)
- #293 - Donald Hoffman: Reality is an Illusion - How Evolution Hid the Truth | Lex Fridman Podcast (opens in a new window)
- Fusions of Consciousness (opens in a new window)
- An Encounter with Radical Darwinitis | Issue 154 | Philosophy Now (opens in a new window)
- 'We feel it in our bones': Can a machine ever love you? (opens in a new window)
- The Case Against Reality (opens in a new window)
- Donald Hoffman - Closer To Truth (opens in a new window)