"When your eyes are open, those areas of the brain that are involved in vision are getting input from the eyes, and this input keeps those areas busy. Consequently, when you have to answer a difficult question or think about some visual memory from the past you either close your eyes or look upward to help you disengage from the world. (Looking up helps, because the ceiling of the room or the sky are often much less visually interesting than what is happening at eye level and below.)"
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