PSYCH 2220 Perception Lecture 8 Seeing in colour
description
Transcript of PSYCH 2220 Perception Lecture 8 Seeing in colour
![Page 1: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/1.jpg)
PSYCH 2220Perception
Lecture 8Seeing in colour
![Page 2: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/2.jpg)
![Page 3: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/3.jpg)
![Page 4: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/4.jpg)
Isaac NewtonSpectrumColour mixing (additive, subtractive)MetamersTrichromacy (Young and Helmholtz)
![Page 5: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/5.jpg)
Figure 9.7 Color mixing with paint. Mixing blue paint and yellow paint creates a paint that appears green. This is subtractive color mixture.
![Page 6: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/6.jpg)
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.
![Page 7: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/7.jpg)
![Page 8: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/8.jpg)
Short wavelength cones
Medium and long wavelength cones
rods
![Page 9: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/9.jpg)
MonochromatDichromat (all mammals except primates)Trichromat (primates)
COLOUR VISION DEFICIENCIES
![Page 10: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/10.jpg)
ISHIHARA PLATES
![Page 11: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/11.jpg)
![Page 12: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/12.jpg)
x x
![Page 13: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/13.jpg)
![Page 14: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/14.jpg)
![Page 15: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/15.jpg)
Trichromacy vs opponency
Can explain colour matching
Can explain adaptation
Young& Helmholtz
Hering
![Page 16: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/16.jpg)
OPPONENCY THEORY
-
-
-
-
?
-
-
![Page 17: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/17.jpg)
RED GREENBLUE
RED-GREENSYSTEM
BLUE-YELLOWSYSTEM
--
--
Colour opponencyis found at the level of RETINAL GANGLION
CELLS
![Page 18: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/18.jpg)
magnocellular
parvocellular
On centre off centre
![Page 19: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/19.jpg)
CONCLUSION
Both trichromacy and colour opponency are correct
![Page 20: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/20.jpg)
P-pathway essential (parvocellular)Lesions in inferotemporal can cause achromatopsia
LEFTEYE
RIGHTEYE
RIGHTEYE
LEFTEYE
OrientationpinwheelsColour
blobs
Organization of a hypercolumn.
Colour blobs
![Page 21: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/21.jpg)
Motion vs still Colour vs grey
![Page 22: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/22.jpg)
SIMULTANEOUS COLOUR CONTRAST
![Page 23: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/23.jpg)
COLOUR CONSTANCY
DIFFERENT SOURCES OF ILLUMINATION HAVE DIFFERENT SPECTRAL CONTENT. But colours look (relatively) the same.
![Page 24: PSYCH 2220 Perception Lecture 8 Seeing in colour](https://reader033.fdocuments.us/reader033/viewer/2022051516/56813ad1550346895da2fc7c/html5/thumbnails/24.jpg)
http://www.youtube.com/watch?v=TVUrHf2kcUM