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When your reading in your head you often read quicker then if you are reading aloud meaning you are more likely to skim over mistakes. "For writers read aloud time continues to be important. It's a habit that helps improve writing skills, as it forces you to be more attentive to your words." said best-selling author, David Sedarsis. I have written short stories or articles many times and looked through them for mistakes and found none but when I show It to other people they often find typos. "The reason typos get through isn't because we're careless, it's because what we're doing is actually very smart," explains psychologist Tom Stafford, who studies typos of the University of Sheffield in the UK. As with all high level tasks, your brain generalizes simple, component parts (like turning letters into words and words into sentences) so it can focus on more complex tasks (like combining sentences into complex ideas). "We don't catch every detail, we're not like computers or NSA databases," Said strafford. "Rather, we take in sensory information and combine it with what we expect, and we extract meaning." When we're reading other peoples' work, this helps us arrive at meaning faster by using less brain power."