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I think it has to do with the difference between seeing and comprehending. When you see an image on a movie/tv screen it's there and gone before you have time to think about it. But with a written document you are forced to slow down and read every single word and understand what you are reading in order to create the picture of what is happening. It's like the difference between a dream and waking life. Even if you remember dreaming you don't often remember many details (if any) but in the waking world you have to pay some attention to what is going on round you even if you don't see/understand everything. So we notice if something doesn't make sense in writing more often than if it's a visual presentation because we have to take more time to comprehend what we are reading.
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