Jackson's Essay 'What Mary Didn' T Know

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What Mary Didn’t Know
Malia Mandl
Philosophy 101
Jackson’s paper What Mary Didn’t Know presents and clarifies a thought experiment is intended to argue against physicalism, the view that everything is physical when it is broken down to its most basic properties. The paper starts off by setting Mary up in a black-and-white room where she is, and always has been, solely exposed to a black-and-white world. Mary is an intelligent scientist who knows everything that can be known about the physical properties of colors. The question is, when she is finally exposed to color, will she learn new factual knowledge or not? Jackson uses this thought experiment to claim that if Mary does, in fact, learn new factual knowledge upon experiencing color, then …show more content…

Churchland states that Mary could have “received a special series of lectures over her black-and-white television from a full-blown dualist, explaining the “laws” governing the behavior of “ectoplasm” telling her about qualia.” He uses this to show that this would not affect the plausibility of the claim that upon her release Mary still learns something. Churchland is saying that this argument would work for dualism as well. Jackson replies by stating this cannot be true because the lectures could not tell Mary everything about qualia. On the other hand, he deduces that to build a good argument against dualism, all that must be done is to replace the premise that she knows everything, and make it so that she is all knowing, according to dualism. This is impossible and does not even make sense and therefore there is no “parity of reasons” as Jackson states. Churchland’s last objection is that Jackson’s argument claims that Mary could not even imagine what the relevant experience would be like and he goes on to argue against this claim. However, this claim was already addressed earlier in Jackson’s article in the first clarification. The knowledge argument claims that Mary wouldn’t know what the relevant experience is like and her imagination is …show more content…

The reason Mary believes she has learned something new has nothing to do with her new acquaintance with color qualia, but instead relates to her visual cortex. After leaving the room, her visual cortex operates the way that cortexes do in other people. What she gains is merely an ability to recognize what seeing red is like, and an ability to remember this new experience. The fact that she needs experience for this ability does not actually carry any anti-physicalists properties. It is easy to recognize that an extensive propositional knowledge does not always guarantee that one also possesses the relevant ability to this knowledge. Although Mary may have known everything there is to know about color and color experience, this does not necessarily mean that she must also have possessed the ability to recognize, remember, or imagine seeing red. If extensive knowledge entailed the relevant ability, then ice hockey teams would be made up of extremely smart physicists who knew everything there was to know about the relevant facts of skating and shooting a puck into the goal. Mary has merely gained the ability to have her own visual cortex function in a new way that others are accustomed to, but she has not actually gained new knowledge about color

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