By deliberately keeping the Dupe at -6 or -5 Science, you can get free Science training. The crucial factor is that when Researching with less than -4 Science, no Dirt is used, and no advance in made on Research, but the Science attribute still level up, albeit very slowly. The Super Computer and pitcher pump aren't used for this trainer, it's just a generic Science trainer. Left is the infection room which doubles as an Athletics/Machinery trainer, there is a living module in the middle, and a science trainer on the right. Getting the first 2 points takes about 20 cycles of training for an infected Dupe (just enough for a single infection), which is in the realm of viable for dedicated players, while getting all 6 points takes around of 130 cycles of training while infected, making it a curiosity rather than a viable strategy.
In short, it's a way to get Dupes up to +6 science without using any Dirt or making any advance to Research (the limiting factor for Science attribute leveling), by infecting Dupes with Zombie Spores. Look no longer, the Monstrous Science trainer is there for you. Do you like free science points? Do you like inflicting illness to your Dupes?