Re: Neuropsychology: "Colour is a pigment of our imagination"
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Re: Neuropsychology: "Colour is a pigment of our imagination"         

Group: alt.philosophy · Group Profile
Author: D H
Date: Sep 8, 2007 12:41

Immortalist wrote:
> On Sep 7, 12:13 pm, D H budweiser.com> wrote:
>> What I've emphasized is obviously not the "real news" of the article.
>> Might be of interest to the "Sir Frederick" sub-tradition of this
>> group.
>>
>> Color Contrast Is 'Seen' By The Brain Early Doorshttp://www.eurekalert.org/pub_releases/2007-09/du-cci090707.php
>>
>> #EXCERPT# Dr Robert Kentridge, lead researcher and lecturer in Durham
>> University's Psychology Department explains: "Colour is a product of
>> our nervous system--it is a 'pigment' of our imagination. The colours
>> that we see are more related to the materials that things are made of
>> than the light reflected from them into our eyes. Making this happen
>> involves many complex processes. One of the earliest involves seeing
>> contrast between pairs of colours. We have found that this important
>> step of seeing colour contrast happens much earlier in the brain than
>> we had realised up to now.
>>
>> "..... Professor Charles Heywood, who leads Durham's Psychology
>> Department, added: "People can distinguish between colours partly
>> because of the contrast with its background. If someone has lost that
>> ability through brain damage, it means that they might see colours as
>> changing all the time. The colour of clothes, and indeed everything
>> else we see, would change dramatically, depending on the colour of
>> light which shines on them."
>
> Reminds me of Hume's idea that, "...When we look about us towards
> external objects, and consider the operation of causes, we are never
> able, in a single instance, to discover any power or necessary
> connection; any quality, which binds the effect to the cause, and
> renders the one an infallible consequence of the other...." in that we
> add alot to the events in the world and attribute these additions to
> the world -itself-
>
> There are no ideas, which occur in metaphysics, more obscure and
> uncertain, than those of power, force, energy or necessary
> connection. ... When we look about us towards external objects, and
> consider the operation of causes, we are never able, in a single
> instance, to discover any power or necessary connection; any quality,
> which binds the effect to the cause, and renders the one an infallible
> consequence of the other.... Consequently, there is not, in any
> single, particular instance of cause and effect, any thing which can
> suggest the idea of power or necessary connection. ...but the power or
> force, which actuates the whole machine [the universe], is entirely
> concealed from us, and never discovers itself in any of the sensible
> qualities of body.... It is impossible, therefore, that the idea of
> power can be derived from the contemplation of bodies, in single
> instances of their operation; because no bodies ever discover any
> power, which can be the original of this idea.
>
> When we entertain, therefore, any suspicion that a philosophical term
> is employed without any meaning or idea (as is but too frequent), we
> need to enquire, from what impression is that supposed idea derived?
> And if it be impossible to assign any, this will serve to confirm our
> suspicion. Now if we produce an idea, like power or necessary
> connection, that we maintain is not derived from an antecedent
> impression, it is not incumbent upon Hume to produce the impression or
> abandon his empiricism. Instead. ...our idea is "without any meaning
> or idea." And as we can have no idea of any thing which never appeared
> to our outward sense or inward sentiment, the necessary conclusion
> seems to be that we have no idea of connection or power at all, and
> that these words are absolutely without any meaning, when employed
> either in philosophical reasonings or common life.
>
> This connexion, therefore, which we feel in the mind, this customary
> transition of the imagination from one object to its ususal attendant,
> is the sentiment or impression from which we form the idea of power or
> necessary connection. Nothing farther is in the case.
>
> Causes and effects are discovered, not by reason but through
> experience, when we find that particular objects are constantly
> conjoined with one another. We tend to overlook this because most
> ordinary causal judgments are so familiar; we've made them so many
> times that our judgment seems immediate. But when we consider the
> matter, we realize that "an (absolutely) unexperienced reasoner could
> be no reasoner at all" (EHU, 45n). Even in applied mathematics, where
> we use abstract reasoning and geometrical methods to apply principles
> we regard as laws to particular cases in order to derive further
> principles as consequences of these laws, the discovery of the
> original law itself was due to experience and observation, not to a
> priori reasoning.
>
> The mental imagery and associations may reflect laws of motion and
> sequence but to claim they internally cause each other doesn't mean my
> mental activites causations reflect the causations of the observed
> sequences of changing atomic configurations.
>
> The Copy Principle accounts for the origins of our ideas. But our
> ideas are also regularly connected. As Hume put the point in his
> "Abstract" of the Treatise, "there is a secret tie or union among
> particular ideas, which causes the mind to conjoin them more
> frequently together, and makes the one, upon its appearance, introduce
> the other".
>
> A science of human nature should account for these connections.
> Otherwise, we are stuck with an eidetic atomism -- a set of discrete,
> independent ideas, unified only in that they are the contents of a
> particular mind. Eidetic atomism thus fails to explain how ideas are
> "bound together," and its inadequacy in this regard encourages us, as
> Hume thought it encouraged Locke, to postulate theoretical notions --
> power and substance being the most notorious -- to account for the
> connections we find among our ideas. Eidetic atomism is thus a prime
> source of the philosophical "hypotheses" Hume aims to eliminate.
>
> The principles required for connecting our ideas aren't theoretical
> and rational; they are natural operations of the mind, associations we
> experience in "internal sensation." Hume's introduction of these
> "principles of association" is the other distinctive feature of his
> empiricism, so distinctive that in the Abstract he advertises it as
> his most original contribution: "If any thing can intitle the author
> to so glorious a name as that of an inventor, 'tis the use he makes of
> the principle of the association of ideas".
>
> Hume locates "three principles of connexion" or association:
> resemblance, contiguity, and cause and effect. Of the three, causation
> is the only principle that takes us "beyond the evidence of our memory
> and senses." It establishes a link or connection between past and
> present experiences with events that we predict or explain, so that
> "all reasonings concerning matter of fact seem to be founded on the
> relation of cause and effect." But causation and the ideas closely
> related to it also raise serious metaphysical problems: "there are no
> ideas, which occur in metaphysics, more obscure and uncertain, than
> those of power, force, energy or necessary connexion"
>
> Hume wants to "fix, if possible, the precise meaning of these terms,
> and thereby remove some part of that obscurity, which is so much
> complained of in this species of philosophy". This project provides a
> crucial experiment for Hume's metaphysical microscope, one designed to
> prove the worth of his method, to provide a paradigm for investigating
> problematic philosophical and theological notions, and to supply
> valuable material for these inquiries.
>
> What would be the "conditions" for solving this process bound
> simulation and it's generality?
>
> http://www.friesian.com/hume.htm
> http://www.wutsamada.com/alma/modern/humepid.htm

Without any detailed information concerning microbiological and
microphysical levels, the fruits of causal interactions would more
often have seemed like reliable miracles or inexplicable emergences
back in Hume's time. But even today a scientific description doesn't
capture the effectual power of the original circumstances that it can
help us manipulate (the "will" that Schopenhauer later referred to?).
A description of a radio signal does not leap-up and oscillate several
thousands or millions of times a second like EM waves. Which is why I
have little idea what kind of "stuff" some linguistic / analytical
philosophers are sniffing or injecting, when at least a few of them
seem to have suggested that our knowledge descriptions can eventually
capture every aspect of ontology or reality-in-itself.
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