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It doesn't seem plausible for something to have same social, emotional, and intellectual behavior without experiencing "qualia", because much of our behavior is expressing and talking about those experiences. I see "qualia" just as a second-order perception of the sensory-information processing within our brains. A little like a program profiler profiling its own process would observe parts of its own execution and process that information. I see no particular mystery in such an inner self-perception. At the same time, given what influences human behavior, it is an essential part for explaining that behavior. Philosophical zombies are an impossibility.