The Redness of Red: fact or fiction?

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Discussion Overview

The discussion centers around the nature of color perception, specifically questioning whether colors like red are objective properties of light or subjective experiences constructed by the brain. The scope includes theoretical considerations, neuroscience, and philosophical implications of color perception.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions if colors are truly seen or if they are subjective constructs, referencing the frequency of red light (650nm) and asking for physicists' perspectives.
  • Another participant asserts that light possesses only properties such as frequency and polarization, suggesting that "red" is not an inherent quality of light but rather a result of neurobiological processing.
  • A different viewpoint discusses the eye's RGB sensors, noting that individuals with color deficiencies may perceive colors differently yet still use color names to describe their experiences, implying a complex relationship between sensory input and brain processing.
  • One participant expresses agreement with the idea that color perception is a construct but mentions doubts raised by a science writer, indicating ongoing uncertainty in the discourse.

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement, with some supporting the notion that color is a subjective experience while others emphasize the physical properties of light. The discussion remains unresolved regarding the nature of color perception.

Contextual Notes

There are limitations in the discussion regarding the assumptions about the relationship between light properties and perception, as well as the dependence on definitions of color and perception. Unresolved questions about the neurobiological processes involved in color perception are also present.

Dr Wu
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This question has been bothering me for sometime now: do we actually see colours? The colour red, for instance, has the frequency of 650nm, but does this explain its "redness" as experienced by humans? Many neuroscientists suggest this is just a phantom, that colours are subjective constructs, nothing more. What do physicists think?

And what about this?

https://www.theguardian.com/technol...lour-illusion-the-dress-blue-black-gold-white
 
Science news on Phys.org
Light has only the property of frequency and polarisation, there is physically nothing "red" about light. How our brain processes the incoming signals from our eyes is something totally different, these are neuro signals processed by the visual cortex.
 
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It looks as if the eye has RGB sensors and just compares the output of each. People with colour deficiency have differing sensitivities of these sensors, yet may describe what they see by colour names. No doubt the brain does not care what the actual sensitivities of the sensors are and just compares the three signals.
 
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Yes, this makes a lot of sense to me too. It was just that a well-known science writer expressed some doubts about it in a book review forum recently, which left me wondering in turn. Thanks for the input.
 
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