Iassume that the reader is familiar with the idea of extra-sensory perception … telepathy, clairvoyance, precognition and psycho-kinesis. These disturbing phenomena seem to deny all our usual scientific ideas … Unfortunately the statistical evidence, at least for telepathy, is overwhelming … Once one has accepted them it does not seem a very big step to believe in ghosts and bogies.’
These words weren’t published in the pages of an obscure occult journal or declared at a secret parapsychology conference. They weren’t written by a Victorian spiritualist or a séance attendee. In fact, their author is Alan Turing, the father of computer science, and they appear in his seminal paper ‘Computing Machinery and Intelligence’ (1950), which describes the ‘imitation game’ (more commonly known as the ‘Turing test’) designed to establish whether a machine’s intelligence could be distinguished from that of a human.
The paper starts by setting up the now-famous thought experiment: a human, a machine, and an observer who asks questions. If the observer cannot work out which one is which based on their responses, the machine has passed the test: its intelligence is indistinguishable from that of a human mind. The vast majority of the paper addresses various objections against the experiment from mathematics, philosophy of mind, or from those sceptical about the power of computers.
But, about two-thirds of the way through the paper, Turing addresses an unexpected worry that might disrupt the imitation game: telepathy. If the human and the observer could communicate telepathically (which the machine supposedly could not do), then the test would fail. ‘This argument is to my mind quite a strong one,’ says Turing. In the end, he suggests that, for the test to work properly, the experiment must take place in a ‘telepathy-proof room’.
posted by f.sheikh