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The puzzle of why the brain, in the absence of external stimuli, activates perceptual systems with such vivid, detailed, and often meaningful content. A hallucination isn't just noise or static; it's a full-blown, internally-generated simulation that the brain categorizes as "real" perception. The hard problem is [understanding] why this happens in otherwise healthy brains (e.g., hypnagogic [hallucinations], grief [hallucinations]) and what it reveals about how the brain constructs reality. It suggests perception is a controlled hallucination, and ordinary waking life is just one where internal predictions are tightly locked to sensory input.
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