Philosophy has corrupted the minds of the young. Again. — frank
Nope. That is just Banno trying to rewrite ancient forum history to console his still hurt feelings.
:grin:
None of that is to deny that Mt Everest is - let's see - 8,849m — Wayfarer
The more important measure in everyday humans terms is that Mt Everest is numero uno. The peak that stands above all others.
But others might protest that is not the metric that encodes the greatest skill, the greatest effort, or whatever else ought to be given prime importance due to some socialised context.
Science might indeed offer you a least socialised metric in terms of metres above sea level. All other aspects of being a mountain – such as being a tectonic bulge rising and falling over eons, or a fractally complex feature that is of some average roughness, hence easier or harder to climb – are allowed to fall away in that particular view.
It might be the measure that is pragmatically useful at a really general level of physical description based on spatial distances at temporal instances. Kind of like, you know, Newtonianism.
:up:
So generally you are right. Folk philosophy does tend to make that primary vs secondary property distinction. And it is sort of there in the data. Hue discrimination seems somehow different even as a neurocognitive act than object recognition.
The perfect sphere of a ball set against the messy fractal scene of a typical natural landscape just kind of pops out as being "that kind of Platonically perfect object that we form as an ideal object".
The backdrop has scale symmetry – a fractal averageness to it. The ball has its rotational symmetry – an abstract symmetry that only comes into view once we get all spacetime relativistic on Nature's arse. That makes a ball a rather striking thing even on our back lawn. It is clearly "out there" even if it is also about as Platonic an object as, well, a square.
Then hue discrimination comes from the other pole of neurocognitive decoding. We can say it is about wavelength – as if a frequency of light is the key that flips the detector switch in a cone receptor cell and our brain suddenly feels that "redness".
And yet really there is huge complexity in the neurology to even start the discrimination. The round football is striking against the fractal garden backdrop. But hue discrimination has to build a whole contextual hierarchy of contrast to get to where it wants to go.
Just as a taster, consider how the three cones are
already set up at the retinal level to construct both the visual sameness and the visual difference that gets the game going. Same information cut both ways in dialectical fashion so as to have any hat to hang the processing on – extract some difference that makes a difference as it has become the signal that stands proud of the noise....
Most animal species have the capacity for color vison, and in all known cases it is based on detecting light with two or more photoreceptor classes that differ in the wavelength sensitivity of their photopigments. However, having more types of receptors does not necessarily confer a higher dimensionality of color vision.
Most humans have three classes of cone receptors maximally sensitive to short (S), medium (M), or long [L] wavelengths, and thus normal (or, more aptly, routine) color vision is trichromatic. Encoding color further depends on the neural machinery for comparing the relative cone responses, for example to determine whether the L cones or M cones are more excited by a light spectrum.
These comparisons begin in the retina, in post-receptoral neurons that receive inputs of the same or opposite sign from different receptor types, and are carried within three “cardinal” mechanisms with distinct cell types and pathways, named for their projections to different layers of the lateral geniculate nucleus.
Cells in the magnocellular (M) pathway sum the L and M cones’ signals and are the substrate of our luminance sensitivity (L+M). Chromatic information is instead carried by two cone-opponent cell types that receive opposing signals from the L and M cones (L-M, the parvocellular or P pathway) or from S cones opposed by both L and M (S-LM, the koniocellular or K pathway).
However, these mechanisms describe only the initial steps of color coding. There are major further transformations of the cone-opponent signals in the cortex, and different transformations may arise at several different cortical stages. Moreover, even within the retina, there is a possibility that color percepts are carried within pathways that combine the cones in different ways than the cardinal mechanisms
With the football in your back garden, it seems to tell its own tale. If it appeared only this morning, perhaps a neighbour booted it over the fence. There seem to be no low level behind the scenes type neural processes going on. If the football is easy to see and explains itself, this is because you understand the intellectual type stuff about rotational symmetry vs scale symmetry. It is your choice whether to take an everyday lumpen realism about balls on lawns or to get mystical about Platonic strength forms.
But with hue discrimination, there is a massive amount of preprocessing to create the same kind of "its just obvious" pop out contrast. To have the immediate and primary impression that the football is blue with yellow stripes and not red with green ones.
At the end of the day, it if pops out, it pops out. Our neurology is doing the job it is meant to do. We can be lumpen realists speaking in everyday language about thoughtlessly inhabiting a cosy familiar world of medium sized-dry goods. The whereabouts of our pending luncheon the only concern.
However the immediacy is an illusion. The reality is the phenomenal complexity of an acquired neurological habit. We must each build hue discrimination for ourselves as bodies that develop neural pathways via processes of growth and pruning. We must get wired for colour as a pragmatic interaction we form with the world as we find it.
That's the look of surprise you see starting to form on the newborn's face as it emerges. Nothing makes sense. And yet within a few months, it really starts to fall into its comprehensible patterns. Footballs that are red. Redness that is not just about footballs.