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The Mystery of the Brain
When you look in the brain, it's all just neural signals going on. There aren't spikes that equate to consciousness and other spikes that are running around unconsciously. So why do some patterns of signals mean the color red? And others mean the smell of apple pie, and others mean the pain of a paper cut? We know that consciousness depends on the details in the brain because even very small damage to your brain can change your consciousness.