What might we ask a potential mind born of silicon? How the AI responds to questions like “What if my red is your blue?” or “Could there be a color greener than green?” should tell us a lot about its mental experiences, or lack thereof. An AI with visual experience might entertain the possibilities suggested by these questions, perhaps replying, “Yes, and I sometimes wonder if there might also exist a color that mixes the redness of red with the coolness of blue.” On the other hand, an AI lacking any visual qualia might respond with, “That is impossible, red, green, and blue each exist as different wavelengths.” Even if the AI attempts to play along or deceive us, answers like, “Interesting, and what if my red is your hamburger?” would show that it missed the point.

Of course, it’s possible that an artificial consciousness might possess qualia vastly different than our own. In this scenario, questions about specific qualia, such as color qualia, might not click with the AI. But more abstract questions about qualia themselves should filter out zombies. For this reason, the best question of all would likely be that of the hard problem itself: Why does consciousness even exist? Why do you experience qualia while processing input from the world around you? If this question makes any sense to the AI, then we’ve likely found artificial consciousness. But if the AI clearly doesn’t understand concepts such as “consciousness” and “qualia,” then evidence for an inner mental life is lacking.