What is your horse thinking? How does fear work in horses’ brains and why do they spook seemingly at random? This article goes in-depth with equine fear: What is your horse thinking?
Note: I disagree with the article on one count: The leader principle where you establish yourself as the horse’s leader and make it move out of your space. I’d rather have the horse accept me as a wiser member of the herd and want to be in my space. But apart from that, this is a really interesting article.