Seonglae ChoOur retina has types of receptors, each sensitive to a range of wavelengths - long, medium and short. But these ranges overlap in places. In particular, the medium cone is never activated on its own; there is no wavelength that only activates this receptor without also activating one of the other two. In this study, the scientists were able to stimulate the medium cones only, using extremely precise lasers directly targeting the concerned cells. The researchers would have thus produced a brand new sensation. Named “olo”. This new colour would be located outside the usual space.
The "Geometry" of Colours, from Newton to Schrödinger...
What are colours? Do they form a particular geometry? Can we build this geometry from our perceptions? All the answers in 20 minutes!
0:00 - Introduction
1:07 - What is a colour?
2:03 - Newton's disc
6:02 - The XYZ space
8:49 - Screens and vision
12:09 - Psychological approach
17:07 - Conclusion
Link to the game mentioned at 13:00: http://colors2.alessandroroussel.com/
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This video is narrated by Octave Masson.
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Alessandro Roussel,
For more info: http://www.alessandroroussel.com/en
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Sources and bibliography:
https://www.researchgate.net/publication/367216474_Helmholtz_and_the_geometry_of_color_space_gestation_and_development_of_Helmholtz's_line_element
https://www.researchgate.net/publication/377372066_Helmholtz_Schrodinger_and_the_First_Non-Euclidean_Model_of_Perceptual_Color_Space
https://link.springer.com/content/pdf/10.1007/s00407-023-00317-x.pdf
https://www.gutenberg.org/files/33504/33504-h/33504-h.htm
http://www.gutenberg-e.org/lowengard/A_Chap03.html
https://royalsocietypublishing.org/doi/epdf/10.1098/rstl.1802.0004
https://pubmed.ncbi.nlm.nih.gov/17026602/
https://www.eizo.com.cn/global/library/EIZO_DCH_APPENDIXA.pdf
https://www.jcgt.org/published/0014/01/01/paper.pdf
http://www.color-theory-phenomena.nl/08.00.html
https://rmit.pressbooks.pub/colourtheory1/chapter/modern-era-c-1850-to-1980/
https://pteromys.melonisland.net/munsell/
https://www.webexhibits.org/colorart/ganglion.html
https://www.icst.pku.edu.cn/mipl/docs/F8A22B42-BDB9-137E-C51F5F9B422FE985_49512.pdf
https://www.pnas.org/doi/full/10.1073/pnas.2119753119
https://www.science.org/doi/10.1126/sciadv.adu1052
https://www.youtube.com/watch?v=7KYwi2F5Ce4
