Siamo tutti daltonici
Saturday, June 28, 2008
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But things are out there just as we see them? What we perceive with our senses touches at least a little 'truth' spoken of by philosophers? Far from even groped to respond to such high matters, I devote myself to understand what 'this thing called color. That something will center 'as well.
We humans are more 'or less all three colors (if the translation is' right), except for the color-blind and lucky tetracromati. In our eyes we have ie 'three types of cells, cones, sensitive to the wavelength of light that comes, named with Short, Medium and Long. Their ability 'to answer' centered at three different wavelengths: blue (Short, 420-440 nm), green (Medium, 534-545 nm) and red (Long, 564-580 nm). These three colors are then usually chosen as a base to build all the others are the primary colors. Anyone who thinks that instead of the three primary colors are cyan, magenta and yellow, simply because he too. The choice of three (or more ') primary colors and' arbitrary. Why '? It 's not being a primary color properties' intrinsic nature? It 's not the color of a property' of the light that is reflected from objects or born? Following Umberto Maturana and Francisco Varela ("The tree of knowledge"), the response (negative) leads away. Staying at the color, we can say something that sounds strano: chi lo percepisce e' colui che lo sta 
creando , e che il colore con la luce centra, ma non troppo. Cioe'.
A ogni singola lunghezza d'onda della luce si puo' abbinare un singolo colore, questo si. Un laser (monocromatico) a 530 nm da' luce verde, a 580 nm gialla. Ma se vedo qualcosa di giallo, al contrario, non posso dire nulla di certo sulla lungheza d'onda della luce da lui emessa, riflessa o diffusa. Potrebbe essere tutto tranne 580 nm. Il motivo e' che esiste un numero infinito di combinazioni di diverse lunghezze d'onda (diversi spettri), che dall'oggetto arrivano al mio occhio, che messe insieme mi daranno la stessa sensazione di "giallo". Ed il colore non e' altro che la
sensazione che noi abbiamo di quella qualita' visiva delle cose. In altre parole colore non e' uguale a lunghezza d'onda: non c'e' relazione biunivoca tra i due. Noi vediamo dello stesso identico colore cose che in verita', se analizzate con strumenti, riflettono o emettono luce con spettri completamente diversi. Il mondo e' piu' "colorato" di quello che ci sembra, siamo tutti come daltonici, perdiamo informazione quando guardiamo.
Come dicevo, c'e' una base biologica a scegliere blu-verde-rosso (RGB) come colori primari, basato su dove e' in frequenza il picco della risposta dei nostri sensori visivi (i coni). Questi sono i colori su cui sono basati gli schermi del computer or television or projectors with three large blue lights just red and green. Adding light Red Green and Blue, make all other colors. Unlike the case with the brushes. Paint, oil or water color have that color that we see why ' absorb the incident light white (containing all wavelengths) all colors except the one that we attribute to. subtract
color to white light, while a projector adds different wavelengths. For this in a projector or the computer sum of all colors (or wavelengths of only three basic) and 'white, while the mixture of all time and' a disgusting black. The total mixture on the palette of the artist has removed all wavelengths from white light (ie black), the pixels of the screen or the projector has the added (ie white). anyway. Let me give an example of something that happened really changed, even on non-bijective 'color-wavelength. Suppose you have a perfect source of yellow light, 580 nm precise (a laser, so for example). Take a glass filter that blocks exactly 580 nm, while all other wavelengths pass through quiet and let us make the glasses. Put on these glasses, should not we be more 'able to see the yellow (the occhiali "anti-Kant" chiamiamoli, per motivi filosofici), perche' quella lunghezza d'onda semplicemente non passa attraverso le lenti e non arriva al nostro occhio. E infatti se andiamo davanti al nostro laser che sappiamo essere giallo non vediamo piu' la sua luce. Bloccano il giallo questi occhiali, pensiamo. Poi pero' andiamo al computer e apriamo una pagina che ha dei bei quadrati colorati sul lato, e cavolo, li vediamo gialli senza problemi! Ma non bloccavano il giallo questi occhiali?
La soluzione, facile, e' che la luce che proviene da quei quadrati gialli che eludono le nostre lenti-filtri, non contengono quasi per nulla la lunghezza d'onda 580 nm che noi chiamiamo "il" giallo. Quella dei quadrati e' light that contains only red and green (no blue) from each pixel. The color yellow and 'format in our brain in spite of the absence of the wavelength that we attribute to yellow. We have created us that yellow squares, in truth, 'there is no' sign of yellow (as a wavelength) in the light of the pixels. The color we perceive, then, is not 'strictly a property' of the objects and the light that comes from them. Rather, it is 'all of these disturbances which are external light, but with' internal neural states of our visual system and cognitive development in general, which are generated by external perturbations. Neurons that were obviously depend on our property physical illness (cones, optic nerve, the connections of neurons in the brain activated by those cones, etc.). So, in our experience of color ourselves with our body structure and physical and mental play a key role. It 's not too unbelievable to even think about, basically. 
Well, instead. Accustomed as we are to think that viewers of something "out there" that happens in a world objectively and independently of us. Why 'The interesting thing' that this long and tedious discourse on color spreads easily throughout our experience. The knowledge, personal experience we have of the world 'out there', and 'essentially a set of patterns and neural states that are stimulated from external (light, mechanical, chemical etc). What pattern and which states will be stimulated neural structure depends essentially on the physical and mental health (which I think are synonyms) of the individual, and not just solely by stimulating parts of the disruption. In fact 'that there are people who literally "see" sounds and "feel" of colors ( Sinestesia ). They have, they do not know how lucky chosen few, the neuronal channels, carrying different functions, such as sound and sight, intersecting with each other: an external perturbation can 'generate stimulus' channels that are normally independent, and "show" a sound. What then these channels may have cognitive also be stimulated by internal disturbances, generated by ourselves for ourselves (thoughts, mental images, ideas, anxieties and emotions), with capacity is being 'self-referential character incredibly complex, complicated and interesting for those who want to understand (including himself).
However, since our experience anchored firmly on our structure, we do not see
"" colors, but we live our color space, we see no
space out there, but we live our field of vision. us create the color, us create the world we experience, this is the conclusion of Varela and Maturana. And the thing is true of any living being, without priority 'to humans. A bacterium experiences a world of chemistry, and maybe he will call 'color what we call the concentration gradient, in which he and' sensitive. The thing I like 'cause, as I said of quantum mechanics , puts the viewer in the world within the world he observes. No more 'mere spectators of a show at the theater, but actors in the scene itself we thought to observe from afar. So dependent on us, the scene, they can say to create it ourselves with our structure. And 'that the our scene, as we see it and feel we do not see anyone else. Ethical implications, yet are essential: come possiamo danneggiare, compromettere o distruggere un mondo che non e' piu' propriamente "la fuori" indipendentemente da noi, ma di cui siamo parte integrante, insieme figli e genitori?
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