If we define a computer as anything that processes information, the brain is at least partly a computer, since it also processes information. But that doesn't necessarily mean that a brain is only a computer. Information processing can be done without subjective experience or qualia. ↵
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A brain's properties therefore transcend information processing. It is completely conceivable that you can construct a physical brain with identical information processing without accompanying experience (zoombie argument), unless you wan't to say that this instance of information process is dependent on also having the experience.