Put any animal under extreme stress, especially while they're young, and they tend to be a bit screwy when they're older. I've worked with traumatized dogs and cats before. Is it any surprise that it'd be the same with humans, especially with a more complicated psyche?

But as Venus pointed out, it's a bit baffling how they can use mice to research the human mind. This certainly looks at the more basic biological factors, but at the end of the day can we really use any other animal for the basis of the human brain?