Not sure what you mean by "trick of language" here, — Mr Bee
I mean that the epistemological problems of acqaintance comes down to the fact that language tends to put on the same footing experiences of *red*, the proposition 'I know that *red*, and other propositions like "I know that red is a colour with a dominant wavelenght of 625 to 740 nanometers'.
Properly distinguished, I think 'I know that *red*' should be considered an improper construction. Its only purpose is to refer to a position in an index of experiences.
I don't think our knowledge of our experience is useless at all. Pretty much everything we know about the world grounds out in facts about our experience. We are able to infer the existence of an external world from the sensations that we have that suggest it is there. Science is based upon empirical observation, which derives knowledge from the things we perceive. IMO, it is because facts about what is directly in front of us (subjectively speaking) are so certain that we use it as the foundation for understanding the world. — Mr Bee
But this is not provided by acquaintance. Bertrand Russell was very clear about that (although he did also think like you that knowledge was ultimately founded by acquaintance). Acquaintance of an object can never tell you anything about the external world, because those statements about the world are not propositions about knowledge by acquaintance, but propositions about knowledge by description. It doesn't put you in contact with the objectivity, or the objectuality, or materiality, it puts you in contact with
something and you know that you have a direct cognitive relation with that something. As such, knowledge by acquaintance is only "existential" knowledge ; if you experience a memory, all the knowledge by acquaintance provided here is that you are experiencing a memory, nothing is experienced by acquaintance about the validity of the memory, about it's content.
That's, in part, why it is useless knowledge. The other reason can be expressed through a thought experiment used to challenge Russell's position on knowledge by acquaintance ; the spotted chicken scenario. Say you are looking at a spotted chicken. It has 47 spots on the side that you can see. Does your knowledge by acquaintance of the chicken and its spots justify the belief that you are looking at the 47-spotted chicken? More than likely not, since almost anyone will readily admit that it's likely there's at least a few spots that could be hidden from my view. Knowledge by description, that is, knowledge of how objects obscure sides when they display others, comes here to modulate the response we have to acquaintance, leading us to believe that the latter is insufficient in founding our beliefs about the chicken and its spots.
Is it possible for one to have a red experience without a "red" object in front of them? If a neuroscientist were to stimulate the parts of my brain that represent a red experience resulting in me feeling like there is a red experience in part of my vision, does that mean that my report about a red experience in that part of my visual field is false? — Mr Bee
At the very least, it could be an acceptable position, given a certain epistemology and ontology.
I certainly agree with that sentiment that the vast majority of what these authors write is hogwash (at least for Descartes mainly, though I can't really blame him given the time he lived in), but I think the cogito is one of the few exceptions to the rule. — Mr Bee
Well, what's the epistemological use of the Cogito, really? Perhaps, let's say someone offers you a bet weither or not you exist, and then ask you what you are willing to bet on it. The Cogito tells us that you should always literally bet everything you can on the fact that you exist, since you won't lose anything if you lose (since you don't exist). That's pretty much it.