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Ghost in the machine
| Thinking hard|
or hardly thinking?
|Major trains of thought|
|The good, the bad|
and the brain fart
|Come to think of it|
The ghost in the machine is a sarcastic description coined by British philosopher Gilbert Ryle, referring to René Descartes' ideas about mind-body dualism. He introduced the phrase in his 1949 book The Concept of Mind, in order to demonstrate the silliness of Descartes' dualist system which hypothesized that mental activity is carried on separately and without any obvious connection to physical activity.
The phrase was used by Arthur Koestler for one of his book titles.