That's why you can't be sure that someone else is conscious. If you program the computer to say it's conscious, that doesn't tell you whether it's conscious or

That's why you can't be sure that someone else is conscious. If you program the computer to say it's conscious, that doesn't tell you whether it's conscious or not, only whether it claims to be conscious. However, you do know that you, yourself, are conscious. Consciousness proves its existence every moment by presenting itself to you, by your own pain being something you can notice. If you were a computer who was simply programmed to act as if you were conscious, there would be no subject to the experience. The rest of the world would think you were conscious, but you would be "dead inside". There would be nothing it would be like to be you. So the reason why the experience called consciousness can't just be explained by the brain processing inputs like a computer is that that gives no theory for why consciousness feels so immediate to the person who experiences it. It explains why someone would act as if he were conscious, but not why consciousness itself would exist the way it shows itself to exist to you every moment.