What is the current thinking on how the brain processes generalizations? For example, the abstract idea of a right angled triangle vs specific instances of right angled triangles? Or the general idea of a cat vs specific instance of cats?
How does a generalization live in the brain? What's the current thinking on how it is encoded?
Medieval philosophers point to such abstractions (that are not material timeless "things") to argue that something itself not material and timeless must exist to "sense" them i.e. a soul. Which is hogwash. But how does one state the nature of such things in terms of human cognition? What is going on when we consider such abstractions?