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Is it moving?

When you look at a moving object, signals go to a special part of your brain. Damage to this area can stop you seeing movement, even though your sight is otherwise normal. One woman, who suffered such damage through a stroke, described what it was like. If she poured out a cup of tea, it appeared frozen in mid-air, like ice. When walking down the street, she saw cars and trams change position, but not actually move.

If you lost your ability to see movement, the traffic might appear frozen in time.
If you lost your ability to see movement, the traffic might appear frozen in time.
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