I think it really comes down to how much hunting pressure an area has. More often than that not, if a mature doe busts you in a stand, you can bet they will be looking up the next time they come through. Now throughout a mature buck or doe's life they are more than likely going to bust at least a few people. Just as they associate humans with danger, they are going to associate that same blob twenty feet up in that tree with danger. If a herd usually patterns the lead doe. It's possible that they will learn to scan "certain" trees for danger by following the lead doe. But do I feel like they somehow pass it down through genetics and all deer will look up and scan trees for danger? No, I don't. But I do believe if a mature doe has been alerted to danger in a certain tree(s), they will learn to scan that tree(s) for danger.