Perceptual blindness is an effect when someone is concentrating on something and passively ignore other details or actions that are in their sight. Perceptual blindness happens all the time, but of course, if you are experiencing it, you won't remember it. I remember the first time when I heard about perceptual blindness, I, myself was a victim in the experiment. But after learning about perceptual blindness I found myself to pay attention more to my surroundings and to my own actions.
I used to think that in movies, why do the protagonists always drive pass each other, or miss small details in critical scenes, where they are actually looking for each other or something important. After learning about perceptual blindness, it makes sense that the protagonists are too concentrated on something else that they miss certain details. People, who are experiencing perceptual blindness, probably won't notice that they are experiencing it until someone else informs them. Perceptual blindness is probably one of the most interesting subjects in psychology that I learned. Below is one of my favorite perceptual blindness video, as much as I would like to tell you about the video, it is best if you watch it yourself.