That type of discussion requires good references.
I skimmed through it, and none of it seemed to reference Kant: it was about, more broadly, how many philosophers have contended we should use the
a priori vs.
a posteriori distinction (and how it relates to the nature of ‘experience’). There’s so much densely packed into section 4, of which you wanted me to read, that I am clueless as to what you are wanting to discuss about it. If there is something in there you want discuss, then please bring it up specifically so I can address it adequately.
Isn't how we perceive reality also how we empirically experience reality? A color blind person would have a different empirical experience then a normal color sighted person. Is that experience apriori or aposteriori?
“empirically experience” doesn’t make sense, and is the source of your confusion: like I said before, ‘experience’ is
both in part
a priori and
a posteriori; and it necessarily must be that way. The term ‘empirical’ (usually) refers to the content of experience which is of reality,
On a narrow account, “experience” refers to sense experience, that is, to experiences that come from the use of our five senses: sight, touch, hearing, smell, and taste. However, this narrow account implies that justification based on introspection, proprioception (our kinesthetic sense of the position and movements of our body), memory, and testimony are kinds of a priori justification. And if we had different senses, like those of bats (echolocation) and duck-billed platypuses (electrolocation), experiences based on those senses would provide a priori, not empirical, justification on this account which takes a priori justification to be independent of experiences based on the senses we have.
We do not have five senses: any pre-structured means of receptivity of objects (which includes ourselves) is form of sensibility. So, introspection, proprioception, echolocation, and electrolocation are straightforwardly senses; I am not sure what they mean by “testimony”; memory is just the reinvocation of previous experience and so is has both
a priori and
a posteriori aspects to it; and hallucination, although they didn’t mention it, has for its
a posteriori aspects fabricated data.
Suppose there is a significant difference between a priori and empirical justification. This still does not tell us what the basis of a priori justification is
a priori justification is linked closely to knowledge: it would be evidence grounded in the way we experience as opposed to what we experience if we take the Kantian use of the terms, and more broadly it would be any evidence grounded in the way we think about reality as opposed anything about reality itself (e.g., law of identity as a logical law by which we self-reflectively reason about our experience).
What truly separates the two?
I’ve made it clear what separates them: what are you contending is wrong with my distinction?
As I've noted, there really is no mental difference between the empirical and non-empirical
How can they not be different? One is about what is in reality and one is about something other than how reality is itself: they are mutually exclusive categories.
So if I am blind and have no sense of touch, it is true in virtue of the way I experience?
In principle, there can be a human which lacks the faculty of understand and reason such that there is no space in which objects are being represented, because there’s nothing being represented (from the outer senses) at all. What you are positing, is fundamentally a person who not only is blind and doesn’t have a sense of touch, but cannot sense at all. All senses that we have which are outer senses fundamentally are cognized in space (e.g., I close my eyes, touch nothing, feel no outer objects, but can still sense where my left finger is located without touching it—that’s in space).
The point about these sort of
a priori propositions being true for human experience; is that they are true for the human understanding: the way we experience; and, yes, it is entirely possible for a human to lack the proper ability to understand reality.
Everything else that we reason about in our head has its root in empirical experience. We create identities, memories, and then have the innate ability to part and parcel those memories into ideas, imagination, dreams, and other thoughts. But to say they are 'true'? What exactly about them is true Bob?
Not everything you said is rooted in the empirical aspect of experience; and that’s what you are equivocating. That a person could think without experiencing anything in space and, let’s grant for your point, which I highly doubt is possible, who lacks a concept of space does not lack it because of lacking empirical data—they lack it because one of the
a priori pure forms of sensibility, space, was never used by the brain (because perhaps their brain is damaged and cannot do it). They lack the concept of space self-reflectively because they’ve never had an outer experience (which would include that
a priori form).
On a separate note, this hypothetical is impossible in actuality; for one cannot think, self-reflectively, through reason without using the concept of space—even if they have never experienced it. Everything we think about implies separation between, at least, concepts.
Moreover, it is plainly seen that the lack of the concept of space is not due to a lack of the empirical aspect of experience (if I were to grant your hypothetical as possible), because if they were to be given a hardcore drug that causes them to hallucinate utter nonsense, which would not be based off of any empirical data because they have never had any, they would immediately become acquainted with space—thusly, it is
a priori.
How does a person who has no senses understand space?
Assuming you mean that they have no outer or inner senses; then they cannot understand space, because they lack the ability to understand anything—what you are describing is a dead person.
(Development of spatial development in babies)
Babies from birth represent objects in space, but they do not from birth know that in which the objects are represented is space; but once they have the sufficient self-reflective cognitive abilities, they can know it and it is
a priori knowledge because it is not justified by any empirical data—it is justified by the non-empirical way that their brain is representing.
Hopefully that helps clear some things up. Good discussion, Philosophim!
Bob