From what I know and read the vision in AVP where the alein is highlighted is just called Alien vision. Apparently the aleins do not show up in any other form of the Predator visions so a specific vision was made to find them. If you look in the beginning of the unrated version where you have the little 1904 part where the whaler is running around and fianlly comes to rest at a sitting down next to a counter and the Pedator walks in, It is in thermal or heat vision and off to the side you can see some movement but can't make it out but you can clearly see the whaler. The predator changes visions and for the one second of the end of that scene the Alien is clearly highlighted but everything around it has become very faint and hard to make out. And for the other for visions I think the Darkness is right. It's regular thermal/heat vision, metal objects, radiation, and then UV.