What is a fact must be possible. And it is a fact that people with disconnected hemispheres have two separate streams of consciousness—two series of thoughts and experiences, in having each of which they are unaware of having the other. Each of these two streams separately displays unity of consciousness. This may be a surprising fact. But we can understand it. We can come to believe that a person’s mental history need not be like a canal, with only one channel, but could be like a river, occasionally having separate streams. I suggest that we can also imagine what it would be like to divide
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