What is the purpose of a pressure cooker in a rice cooker? Some of the more expensive rice cookers advertise that they use pressure in combination with induction to cook rice.  On one Japanese website that sells rice cookers, they showed some diagrams that I couldn't follow since they were in Japanese, however, the images seemed to indicate that the water is changed in some way (maybe taste) because of the pressure cooker.  

The rice cookers that include a pressure cooker cooking method are also more expensive.  So, what exactly is the purpose of this pressure cooker method?

Thanks!
The usual purpose of pressure in pressure cookers is that they can heat water to >100°C without it starting to boil, thereby reducing cooking time.