Francis Crick — "The brain is a machine."
The brain is a machine.
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More from Francis Crick
"We are just a collection of molecules."
"If you want to be a scientist, you have to be prepared to be wrong a lot."
"One of the most striking features of the human mind is its ability to believe what it wants to believe."
"There is no scientific evidence for the existence of a soul."
"The truth is rarely pure and never simple."
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Understanding this quote
What it means
The brain operates through physical and chemical processes — neurons firing, molecules binding — not through any mystical or spiritual force. Consciousness, thought, and emotion are outputs of biological machinery. This rejects any notion of a soul or supernatural mind and insists that understanding the brain means studying it like any other complex physical system, subject to the same scientific laws governing everything else in nature.
Relevance to Francis Crick
After co-discovering DNA's double helix in 1953, Crick pivoted to neuroscience in his later decades, driven by the same reductionist conviction that unlocked genetics. His 1994 book "The Astonishing Hypothesis" argued consciousness is entirely a product of neural activity — scandalous to many. A lifelong atheist, he believed no phenomenon, including the self, lay beyond scientific explanation. This quote is the thesis sentence of his second major scientific life.
The era
Crick worked through the mid-to-late 20th century, when computers and cognitive science transformed how scientists thought about minds. Turing's 1950 paper asking "Can machines think?" seeded decades of debate, and AI research treated cognition as computation. The molecular biology revolution Crick helped launch emboldened scientists to explain life mechanistically. By the 1990s — formally declared the "decade of the brain" — his materialist claim felt both radical and perfectly timed.
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