Pipinjo, yes, loads of new research from all over the world where they're doing scans and dissections and finding real differences in brain structure, lots of it to do with the amygdala and the temporal pole and the connecting bits between them.
OK, let's take a 'normal' person first:
Your eyes see someone and send the signal straight to the "is it a person or a tree?" bit first.
Then your eyes are supposed to look for their eyes and their face, and send that info to the bit of the brain called the Amygdala which is buried right in the middle of the brain. It checks for anger or fear in the other face.
If they look angry or fearful, it presses the PANIC button and all hell breaks loose. (Run/hide/scream/shut down/shake with fear etc).
If they don't, it asks a bit called the Temporal Pole (bit of the brain behind your ear) to go find everything it knows about that person. Their name, how long you've known them, what about them, what do they like, what is their body language doing etc. This bit is super-fast and it can work out a whole group of people at once. Amazing.
Then the rest of the brain can co-ordinate all the body language you do, and link it in to this superfast wiring, so you mimic that person's smile, tone of voice, etc. Congrats, you've made a friend! Maybe lots at once!
Except with us, our brains look at the person and can't work out if it's a person or a tree. And if it sees eyes, it gets the message to the Amygdala, which is sort of broken, so it presses the panic button anyway just in case. We're now totally panicking because there's eyes looking at us.
Then it can't find the Temporal Lobe and can't ask who the person is or tell you about them.
We haven't made a friend. We've no clue who this is or what their intentions are, but it sure feels scary.
I need people to use words. "Hello, I'm Helen, and I'm your friend! Would you like a hug?" That sort of thing. Takes some getting used to, but that's how it works when the whole wiring-bit isn't connected up the same way.
Weirdly, though, that Temporal Pole bit in our brains is used for data storage instead, it seems. We can go get data from our brains on stuff at the same speed as you go get data on people - incredible detail, incredible processing time. (generalising throughout).
More research to be done, but it's really interesting. Well, it is for Ambers anyway.