A good portion of how we each treat this is influenced by how we treat the various undead I suspect.
For example, I look at a Skeleton and see a stack of bones. They are not a natural occurrence (in my world a Skeleton HAS to be created). They have no ability to sense naturally... no eyes, nose, ears (along with everything else obviously) so I need to explain their ability to be aware of things in another manner.
Zombies I see as kind of alive. No one needed to create them, it's more like a disease. So they still use their normal senses (if able). This is why they are slightly 'dumber' or less aware than a normal human (their senses have been dulled, damaged, are missing, whatever).