Several objections to Jackson have been raised on the grounds that Mary does not gain new factual knowledge when she leaves the room, but rather a new ability. Nemirow claims that "knowing what an experience is like is the same as knowing how to imagine having the experience". He argues that Mary only obtained the ability to do something, not the knowledge of something new. Lewis put forth a similar argument, claiming that Mary gained an ability to "remember, imagine and recognize." In the response to Jackson's knowledge argument, they both agree that Mary makes a genuine discovery when she sees red for the first time, but deny her discovery involves coming to know some facts of which she was not already cognizant before her release. Therefore, what she obtained is a discovery of new abilities rather than new facts; her discovery of what it is like to experience color consists merely in her gaining new ability of how to do certain things, but not gaining new factual knowledge. In light of such considerations, Churchland distinguishes between two senses of knowing, "knowing how" and "knowing that", where knowing how refers to abilities and knowing that refers to knowledge of facts. He aims to reinforce this line of objection by appealing to the different locations in which each type of knowledge is represented in the brain, arguing that there is a true, demonstratively physical distinction between them.By distinguishing that Mary does not learn new facts, simply abilities, it helps to negate the problem posed by the thought experiment to the physicalist standpoint.