I see your points. I just don't know how to do you measure this.

I would think it would be based on the experiences of each person.

For Example:

I am black. A white kid lived across the street from me.

When I would go out and play in the front yard. I would see the kid playing in his front yard.

We would always look at each other.

One day his mom said he could go over. So he crossed the street and said "What are you playing with". He became one of my best friends that I know close to 40 years later.

So I just don't know how would you test for this.