Robert J. Marks (from the Evolutionary Informatics Lab) and George Montañez (ID is like the Turing test) offer some thoughts on how you can really know if you are talking to a computer:
First, claims that a given program has “passed the Turing test” should be treated skeptically because a program can be optimized to pass the Turing test without demonstrating any particular intelligence at all.
Robert J. Marks: It’s always easy to determine if you are talking to a computer or a human. You can just ask them to compute the square root of 30 or something because a human would take a while to get the square root of thirty …
Hint: Humans, even very gifted ones, must think in order to do difficult calculations. A machine dedicated to calculations does not think; it produces a correct answer to any calculation very quickly— provided that the mechanism enables it.
“How you can really know you are talking to a computer” at Mind Matters News
Otherwise, it would produce nothing. There’s a place to start. But it gets better.
See also: Computer guy/philosopher: AI can’t do abductive reasoning,