The eyes, too, are built to reduce signal when needed: not only are color receptors clustered toward the center of the eye, making your peripheral vision markedly different from what your brain directs you to focus on,[*31] but eyes regularly respond to internal thought, too. If you’re a person who can see, when you’re asked to imagine or remember a vivid visual scene, your pupils will dilate, even though you’re not paying attention to the external world at that moment. When your brain is internally modeling visual information, the nerve pathways that control the muscles that contract and
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