And what about computers? Suppose computers are developed to the point where they can be used to control robots that look on the outside like dogs, respond in complicated ways to the environment, and behave in many ways just like dogs, though they are just a mass of circuitry and silicon chips on the inside? Would we have any way of knowing whether such machines were conscious?
[What does it all mean? Thomas Nagel]
What does the word "they" refer in the context? computers or robots