On the Aristotelian account of abstraction, we abstract the forms of
things via perception. But here is a problem. First of all, we sometimes
have better knowledge of things not perceived than of things perceived.
Let’s say you read a detailed scientific book about pangolins, though
you’ve never encountered one, while I once saw a koala in a zoo, but
don’t much know anything more about them than that they are cute
marsupials. It seems quite problematic to say I have the form of the
koala in my mind, but you do not have the form of the pangolin. For that
would make the mental possession of the form of the thing an unimportant
flourish to what really epistemically matters, since clearly you are
better off epistemically for reading the book about pangolins than I am
for seeing the koala.
Of course, presumably, the author of the pangolin book presumably saw
the pangolin. But that doesn’t seem to matter much, either. There are
many dinosaur species where the paleontologist knows more about the
species than I know about koalas, and yet no human ever perceptually
interacted with a dinosaur, but typically only with minerals that have
displaced their carcasses.
What should someone committed to the Aristotelian story about
abstraction say? Two options come to mind, a modest and an expansive
one.
Modest option: It really doesn’t really matter much
epistemically whether one has the form of a pangolin or a koala in one’s
mind. What matters is the propositional knowledge. However, it is
essential to our possession of the propositional knowledge that our
thoughts have intentionality, that they refer to the world. And it is
crucial to securing intentionality that we have Aristotelian abstraction
at the interface between the world and the mind. The triceratops
expert’s intentionality with respect to triceratopses is derivative from
the causal chain from triceratopses to their corpses to their fossils to
the light reflecting from the fossils into the expert’s eyes to
(eventually somehow) the expert’s thoughts. Where the causal chain
crosses from the world to the mind, we need a transmission of form to
ensure intentionality for the whole chain. Maybe the transmission
happens when the minerals that have replaced the bones transmit their
mineral forms to the expert’s mind, in some mysterious way mediated by
the light.
Expansive option: Everything in the world carries
the forms of everything nondivine that is causally upstream from itself.
The triceratops corpse somehow has the form of the triceratops in it,
and so do the bones of the triceratops, and so do the minerals that
replace the bones, and so does the light modulated by reflection from
the minerals, and so do the electrical impulses in the nerves from the
retinal receptors to the brain. It is easier to extract the form when it
comes from seeing a live koala than when it comes from seeing fossils,
so that a layman can do the former while the scientist is needed to do
the latter. Similarly, when you read a book about pangolins, the ink on
the page, being causally modulated by the author’s knowledge, carries
the form of the pangolin (in addition to any forms naturally contained
in the ink, say those of the particles constituting the ink).
Medievals already said something like this about the modulated light,
so it’s just a matter of extending the story. And while the problem I am
concerned about is one that does not require any science or technology
beyond what the medievals had—the medievals knew about the gaining of
expertise from books (if anything, they might have overestimated it!)—in
a modern setting we it feels like an Aristotelian has to do this. After
all, it is hard to deny that one can gain the same kind of knowledge of
koalas by looking at them through high-end augmented reality goggles as
from directly seeing them with our eyes. Thus, on a form-transmission
story, the electrical potentials of the capacitors in the computer
memory in the goggles have to somehow carry the form of the koala. But
given the many ways that computer memory can be realized (think of
magnetized rings versus capacitors versus markings on a CD), it seems
plausible that any effect will have to have to be admitted to carry the
form of its cause. It is tempting to say the form is only found in
substances where there is sufficient data to reconstruct significant
information about the causally-upstream object the form is of, but I
think is not tenable. Presumably each bacterium is a substance, and we
could have a type of biological memory in augmented reality glasses
where each bit of information is stored in a different bacterium.
This story coheres very nicely with the essentiality of origins. It
is a kind of a reversal of the principle of proportionality of causation
on which the reality of the effect is actually or eminently found in the
cause: the formal reality of a cause is found in the effect. I think
it’s a defensible story. But I also find it hard to believe.