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In the field of Cognitive Science, when studying about the Stroop effect, the claim is often made that it had been used during the Cold War by the American counter-intelligence units in order to identify Russian spies.

For example, this blog article How To Catch A Russian Spy quotes from the book Willpower:

the Stroop task became a tool for American intelligence officials during the cold war. A covert agent could claim not to speak Russian, but he’d take longer to answer correctly when looking at Russian words for colors.

The idea is that you can't control the effect that your native language has on your performance on this task, so it can be used to uncover your native language. Is there any historical evidence of this usage?

  • Explaining the claim here, via a quote, would be helpful. – LаngLаngС Jun 30 '18 at 14:23
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    Of course that would not work to find Americans who spied for the Russians. And if someone admits he comes from Russia but claims not to be a spy, that test cannot tell if he is a spy, although it might possibly indicate he came from Russia at a different time than he says. – M. A. Golding Jun 30 '18 at 19:02
  • The claim isn't that the Strood test is universally useful in catching all spies, but that it can reveal whether someone is a native / fluent Russian speaker, which may be a useful test in the case of a suspected spy who claims not to speak Russian. So the question is whether there are any confirmed cases where the test did provide critical information in uncovering a spy. – PhillS Jun 30 '18 at 20:40
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    Re Stroop, the claim is that it can reveal whether someone is a native/fluent speaker of any language in which the test is given, it's not specific to Russian. The question is whether it was even attempted, let alone really yielded results. – Vitaly Mijiritsky Jul 1 '18 at 3:05
  • I found the claim repeated on a PT blog but with no more specifics, alas. – Fizz Jul 1 '18 at 5:05

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