I appreciate the response, and I see that we need to address more the
a priori vs.
a posteriori distinction more in depth before we move on to that distinction as it relates to knowledge. So, for now, let’s forget about
a priori vs.
a posteriori knowledge, and focus on the generic distinction itself.
but you seemed to divide this experience between the empirical and non-empirical. This is where I'm confused.
Yes, this is the root of the confusion (I think). When I was saying, before, that
a priori knowledge is knowledge gained independently of “experience”, I was using my terminology too loosely and that is my fault: what I should have said is “<…> independently of our experience
of reality”, as that denotes the aspects of experience which are
a posteriori—i.e., empirical.
By “experience”, I just generically mean the conscious awareness of which one is having; so why would I say there’s an
a priori and
a posteriori aspect to that experience? Because, simply put, there are things which my brain is adding into the mix (i.e., are synthetical) which are not actually of the sensations (of objects in reality) in order for it to
represent them in the conscious experience which I will have of them.
The Kantian way of thinking about it, philosophically, is essentially:
1. An object “impacts” your senses.
2. Your sensations produce sensations.
3. You brain intuits objects from those sensations in space and time.
4. Your brain cognizes objects, according to logical rules and conceptions, in space and time.
5. You experience an object, or objects, in space and time.
If the sensations are intuited in space and time, then space and time are not contained themselves in the sensations; and it is even clearer when you realize that your brain cannot possibly learn how to represent things with extension nor succession to do it in the first place. Hence, the extension and succession which you experience things in and of, are not from the sensations and hence are not empirical (even if the brain learns how to represent the causal relations of things better with space and time as it develops).
So, e.g., space and time are forms in and of which your brain represents things and are not properties of the things-in-themselves (whatever they may be). This means that space and time are like the containers in which the content of experience is placed; and this is just a simplified way of saying that they are
a priori and used to represent
a posteriori content.
What you seem to be claiming, and correct me if I'm wrong, is that someone knows what space is before they've experienced it
No. I think that there’s a difference between the self-reflective reason—i.e., meta-cognition and self-consciousness—and non-self-reflective reason (i.e., cognition and consciousness). My brain has the “capacity”, as you put it, to represent in space and this extensional representation is not a reflection of any extension, per se, that an object itself actually has; but I must come to know, by experience, that I can extract out one of the forms of my experience as spatiality and that is is
a priori.
This is why Kant famously said that all knowledge begins with experience, but not all knowledge arises out of experience. It was an catchy way of saying “not all knowledge is acquired and grounded in empirical data—
a posteriori data”: there are certain ways we are pre-structured to perceive which necessarily are not reflections of anything in reality.
How is knowledge gained apriori?
Through experience, but not through empirical data. It is a transcendental investigation into how our cognition represents things, independently of what is being represented, in pre-structured ways.
I agree with this notion, but I'm not sure that's what Kant actually believes
I can’t speak for what Kant actually believes without being in his own mind; but I can say that the CPR seems pretty clear to me that what he means is that experience contains both an
a priori and
a posteriori aspect because there are necessary preconditions the possibility of that experience which are about how we are pre-structured to experience as opposed to the representation of the empirical, sensational content of that experience.
If you've never experienced space or its concepts, you don't know it.
I was entertaining your idea that someone could be thinking, self-reflectively, without ever having an inner or outer sense of space. If that is true, then they still would implicitly being using the concept of space, because reason fundamentally thinks in terms of space. E.g., if I am thinking about “bawwws” vs “glipglips”, even if they are utter nonsense, I am making
separations and
distinctions between them, which is inherent to reason, and this is
conceptually spatial. You can’t have thoughts which don’t imply any conceptual separation between other concepts and ideas which you have—viz., you cannot think without space. You may not call it “space”; you may not know it is “space”; but when you are thinking you are thinking in terms of space. If you don’t believe, then just try to come up with a counter-example, and I will demonstrate that it is still using, implicitly, conceptual separation between thoughts, ideas, and concepts in play.
"Inner senses" is a misnomer.
Of course there are inner senses: they are senses of oneself or, more broadly, any sense capable of sensing the being which has those senses. Which leads me to:
I'll agree that proprioception and echolocation are definitely senses, but introspection?
I was assuming by introspection we are talking about self-consciousness, and this requires an inner sense; for one cannot know they are experiencing by merely experiencing: they must also have the capacity to acquire knowledge about their own experience. It is entirely possible to have a brain that is damaged in such a way as to still experience but lack self-experience.
You only have knowledge of yourself insofar as you affect your own senses. Which entails that there is not “I think, therefore I am” kind of direct window into one’s own self.