I know as certainly as I know anything that I&#x27;m conscious. You know the same fact with the same certainty about yourself.  The problem of whether I can know that about you is a different problem altogether.<p>Edit: Or to put it another way which might be clearer: If it&#x27;s possible for you to doubt whether you yourself are conscious then you define &quot;consciousness&quot; differently than I do, and so we are talking past each other.