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PSYCH 2220 Perception Lecture 8 Seeing in colour

PSYCH 2220 Perception Lecture 8 Seeing in colour. Isaac Newton Spectrum Colour mixing (additive, subtractive) Metamers Trichromacy (Young and Helmholtz).

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PSYCH 2220 Perception Lecture 8 Seeing in colour

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  1. PSYCH 2220 Perception Lecture 8 Seeing in colour

  2. Isaac Newton Spectrum Colour mixing (additive, subtractive) Metamers Trichromacy (Young and Helmholtz)

  3. Figure 9.7 Color mixing with paint. Mixing blue paint and yellow paint creates a paint that appears green. This is subtractive color mixture.

  4. Figure 9.9 Absorption spectra of the three cone pigments. From Dartnall, H. J. A., Bowmaker, J. K. and Mollon, J. D. (1983). Human visual pigments: Microspectrophotometric results from the eyes of seven persons. Proceedings of the Royal Society of London B, 220, 115-130.

  5. Short wavelength cones rods Medium and long wavelength cones

  6. COLOUR VISION DEFICIENCIES Monochromat Dichromat (all mammals except primates) Trichromat (primates)

  7. ISHIHARA PLATES

  8. x x

  9. Trichromacy vs opponency Can explain adaptation Can explain colour matching Young & Helmholtz Hering

  10. OPPONENCY THEORY - - - - ? - -

  11. Colour opponency is found at the level of RETINAL GANGLION CELLS

  12. On centre off centre magnocellular parvocellular

  13. CONCLUSION Both trichromacy and colour opponency are correct

  14. P-pathway essential (parvocellular) Lesions in inferotemporal can cause achromatopsia Colour blobs

  15. Motion vs still Colour vs grey

  16. SIMULTANEOUS COLOUR CONTRAST

  17. COLOUR CONSTANCY DIFFERENT SOURCES OF ILLUMINATION HAVE DIFFERENT SPECTRAL CONTENT. But colours look (relatively) the same.

  18. http://www.youtube.com/watch?v=TVUrHf2kcUM

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