The latest research implies that there is a part of the brain that is focused on recognizing human faces, as well as interpreting the emotion that is on the human face. Fearful and angry faces get the most and quickest attention, but any face gets a lot of attention. The circuitry in the brain from this specialized spot is believe to go right to the amygdala, which processes emotions. So it is fast, since it doesn’t have to go through the normal route that most vision goes through (the cortex and conscious mind). This means that you are processing faces unconsciously.

https://www.blog.theteamw.com/2009/12/24/100-things-you-should-know-about-people-20-your-attention-is-riveted-by-pictures-of-people/