This thought experiment was inspired by a fascinating discussion I recently had with kennethamy regarding the question, "Can a person know something without knowing that he or she knows it?" Although the experiment resembles a proof, it is more of a hypothesis than anything else.
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1. In order to have knowledge of a thing, a person must at least have-or be able to summon-a true mental image of it. By "true," I mean that the qualities of the image correspond exactly to the qualities of the thing that is known; i.e., the image "looks exactly like" the thing that is known.
2. Smith (our hypothetical person) has knowledge of a thing (T).
3. Therefore Smith at least has, or is capable of calling up, a true mental image of T.
4. Smith does not know that he has knowledge of T.
5. Therefore, Smith cannot have a true mental image of himself in the act of having a true mental image of T.
6. To say that a person has a mental image of something (any T), is to say that he or she is conscious of it.
7. QED: Smith can never be truly conscious of himself in the act of having a true mental image of T.
As I see it, #7 is a contradiction since it suggests that Smith can have a mental image without being truly or fully conscious of the fact that he is having it-i.e., that he can have an
unconscious or
semi-conscious mental image.
If images are conscious, or are among the phenomena of consciousness, then it seems unlikely that they can exist either fully or partly
outside of consciousness. Smith, therefore, cannot be ignorant, unconscious, or half-conscious of the fact that he knows T; for if he is, then he does not really know T.
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Although there are a whole lot of "ifs" in this thought experiment, I thought I would present it to you anyway-just for fun. If I'm wrong about anything, which is
extremely likely, I encourage you to bring it to my attention.