One of the main features of autism is the lack of a foreground/periphery differentiation. This is particularly noticeable in hearing, since we can become overwhelmed by background noises which we cannot filter out in order to focus on the foreground. For most people it is an automatic, natural thing to filter out the background and focus on what you want to hear—typically whoever is talking to you. However, people with autism get everything at once.
However, this is also true with vision. We are easily distracted by things in our peripheral vision, causing us to look around, glance at everything. This is easily taken as attention deficit, but what it is in fact is attention to too many things at once. At its worst, it can be overwhelming. And it’s at least annoying to anyone you’re speaking to, who is expecting you to look at them the entire time.
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