Why It’s So Hard to Catch Your Own Typos.

The reason typos get through isn’t because we’re stupid or careless, it’s because what we’re doing is actually very smart … When you’re writing, you’re trying to convey meaning. It’s a very high level task … 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 Stafford. “Rather, we take in sensory information and combine it with what we expect, and we extract meaning.”