Half man, half mouse

Refering to my post below, I think it's an interesting idea: a human's brain inside a mouse! Quoting from the article:
'Professor Henry T. Greely, director of the Center for Law and the Biosciences and leader of the committee that considered the proposal, ..., (said), "We concluded that if we see any signs of human brain structures . . . or if the mouse shows human-like behaviors, like improved memory or problem-solving, it's time to stop."'

Can you imagine that?! For the first time, humankind will finally be able to get the perspective of being another animal!

But really I wonder why they want to do this? According to this article it's to investigate brain diseases like Alzeimers, schizophrenia, etc.. I still don't if I like the idea. I know people and families suffer with these dreadful diseases but we don't test on people. Why not? because we say that human's have some inalieble human rights. Why don't animals have rights? I think any form of testing should be voluntary. Since animals can't give their permission perhaps they shouldn't be used.