In 2003 a patient known as TN lost his sight after suffering two successive strokes; the visual cortex in his brain was damaged and his vision was totally gone, although the eyes themselves were still healthy. During one examination years after he lost his sight, researchers were flabbergasted to see TN carefully navigate a hallway full of overturned chairs, scattered boxes and other obstacles without colliding with a single thing. How was this possible for a person who was completely blind?
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