Naked Science Forum
Life Sciences => Physiology & Medicine => Topic started by: neilep on 16/12/2019 14:53:45
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Dearest Peeps Of Klevur Knowing Stuff,
Look here.
Here's an eye !!
(https://drive.google.com/uc?id=1klvj-qiboJ4o90Ic2Xg_IudNiw6_sDG3)
"look Into my eye, "
How do I know that my eyes perceive colours exactly the same as yours ? For all i know your orange might be my green ?
supplemental kweschuns:
Do both eyes see colours exactly the same ?
Does the colour of eyes have any effect on colour perception ?
Will I still perceive colours the same when I'm 80 like i do now ?
*What's your favourite colour ? (US translation service: "colour" = "color" sheesh !!)
* supplemental to the above supplemental: Why do we prefer certain colours over another ?
ewe **see, i don't know !! with your help i will know and that will make me klevur innit ?
Thank ewe
Neil
**pun intended !!
Oh colours are great because they make seeing fun
From a red strawberry to a brown currant bun
Just look around and see colours in your town
Be grateful your bum has no eye else all you'd see is brown !!
DOH !!..that's just silly lol
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Dearest Peeps Of Klevur Knowing Stuff,
Peeps with peepers is more like it.
How do I know that my eyes perceive colours exactly the same as yours ? For all i know your orange might be my green ?
You don't. No way to compare subjective experience, but there are some people that see more colour than typical, sort of the opposite of being colour blind. They see patterns in flowers that might appear white to me. They get offended that the crayon box never seems to be anywhere near complete.
Squirrels see yellow. Humans do not, and the banana appears the same colour as an object that emits only red and green light. Squirrels could tell the two apart effortlessly, not because they see better, but because they see actual yellow.
Do both eyes see colours exactly the same ?
I think one would notice if otherwise, so barring health issues, yes.
Does the colour of eyes have any effect on colour perception ?
No
Will I still perceive colours the same when I'm 80 like i do now ?
Again, barring health issues, yes. I've had cataracts, so my world sort of faded to foggy white. My colours were not off, but I needed 3cm high font to read anything. All fixed now. My mother lost most of here colour vision and was amazed when it was restored. All the vivid hues and such that she'd forgotten about.
*What's your favourite colour ? (US translation service: "colour" = "color" sheesh !!)
Boring if there's only one. The prior owners of my house liked gold. All the drapes, carpets, hardware, and even the cars. Sheesh indeed...
Why do we prefer certain colours over another ?
I don't, so don't know.
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There are different variants of the genes which allow color perception.
- Some of them don't work at all, resulting in reduced range of color sensitivity (eg dichromats can only clearly distinguish two bands of color)
- Some of these gene variants function equally well, but have a slightly different spectral sensitivity from other variants, so these people would see a slightly different mix of colors.
- It is genetically possible for women to have two different variants of the red cone cells, allowing them to distinguish colors that look the same to most of the population (including all men). At least one example of a tetrachromat has been documented.
So Nigella can (potentially) see some things that Nigel can't - maybe that's why she likes red dresses?
But that's nothing compared to some shrimp which can see 10 or more color bands (plus polarization).
So one person may see Colours while another sees different Colors; it's all in the eye of the beholder
- This was one of Webster's more successful spelling reforms; but aker is still spelt acre, even in the USA.
See: https://en.wikipedia.org/wiki/Tetrachromacy#Humans
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On a science blog, we are likely to consider colour in terms of physics (wavelength of light) or biology (spectral sensitivity of cone cells).
But colour processing and classification occurs deeper in the brain.
I understand from a school teacher that children of Vietnamese background are likely to regard blue as just another shade of green, rather than a colour in its own right. So in this language context, blue is not a really colour.
This may be one reason why most women who were genetically tetrachromats could not label colours differently - they had always been told that they were all "red".
Colour perception is a psycho-linguistic construct (to coin a phrase...)
See: http://theconversation.com/languages-dont-all-have-the-same-number-of-terms-for-colors-scientists-have-a-new-theory-why-84117
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Dearest Peeps Of Klevur Knowing Stuff,
Peeps with peepers is more like it.
How do I know that my eyes perceive colours exactly the same as yours ? For all i know your orange might be my green ?
You don't. No way to compare subjective experience, but there are some people that see more colour than typical, sort of the opposite of being colour blind. They see patterns in flowers that might appear white to me. They get offended that the crayon box never seems to be anywhere near complete.
Squirrels see yellow. Humans do not, and the banana appears the same colour as an object that emits only red and green light. Squirrels could tell the two apart effortlessly, not because they see better, but because they see actual yellow.
Do both eyes see colours exactly the same ?
I think one would notice if otherwise, so barring health issues, yes.
Does the colour of eyes have any effect on colour perception ?
No
Will I still perceive colours the same when I'm 80 like i do now ?
Again, barring health issues, yes. I've had cataracts, so my world sort of faded to foggy white. My colours were not off, but I needed 3cm high font to read anything. All fixed now. My mother lost most of here colour vision and was amazed when it was restored. All the vivid hues and such that she'd forgotten about.
*What's your favourite colour ? (US translation service: "colour" = "color" sheesh !!)
Boring if there's only one. The prior owners of my house liked gold. All the drapes, carpets, hardware, and even the cars. Sheesh indeed...
Why do we prefer certain colours over another ?
I don't, so don't know.
Thank you very much Halc for your wonderful answers and explanations.
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On a science blog, we are likely to consider colour in terms of physics (wavelength of light) or biology (spectral sensitivity of cone cells).
But colour processing and classification occurs deeper in the brain.
I understand from a school teacher that children of Vietnamese background are likely to regard blue as just another shade of green, rather than a colour in its own right. So in this language context, blue is not a really colour.
This may be one reason why most women who were genetically tetrachromats could not label colours differently - they had always been told that they were all "red".
Colour perception is a psycho-linguistic construct (to coin a phrase...)
See: http://theconversation.com/languages-dont-all-have-the-same-number-of-terms-for-colors-scientists-have-a-new-theory-why-84117
Thank You Evan for your great and very informative responses. The links are very interesting and informative.
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Yes, because red is a danger colour, green is a nature colour, blue is a water colour and brown is a brown colour, indistinct. Any further than that your into psychology and philosophy.
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For all i know your orange might be my green ?
Society ensures that this doesn't happen.
If we both went to kindergarten in the same language and culture, we had drilled into us that the fruit of an orange tree is orange, and the leaves of an orange tree are green.
So the wavelength(s) emitted/reflected by objects are translated into excitation of cone cells in a way that will vary slightly with individual genetics. But the language label we put on that excitation is normalized in kindergarten, so your orange is my orange.
By the end of kindergarten, any child who randomly draws the trunk of an orange tree in (say) purple has been sent for color-blindness testing.
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The distribution of Red, Green and Blue-sensitive cone cells across the retina is very individual.
So it is quite likely that you will have Red and Blue cone cells in retina locations where I have Green-sensitive cells.
There is a critical period during infancy where your retina and brain finalize the wiring of these cells - blindness during this period (eg due to cataracts) leads to permanent vision impairment.
A slogan in neuroscience is that "cells which fire together wire together".
So a child who sees colored blocks hanging above their bed will have groups of nearby cone cells that fire at the same time. This theory suggests that the cone cells which have the same color sensitivity will be grouped together for transmission to the brain, while cone cells of different color sensitivity will be grouped separately.
Attaching labels/words to these colors is done in the brain, during language learning.
See: https://en.wikipedia.org/wiki/Hebbian_theory
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I think no. All people have no same perception of colors. People having different degrees of color blindness in their both eyes, they have a different color perception depending on the eye even on the same subject.