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Lecture 6

PSYC 100 Lecture Notes - Lecture 6: Color Vision, Color Blindness, Subtractive Color


Department
Psychology
Course Code
PSYC 100
Professor
Russell Day
Lecture
6

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UNIT 4: SENSATION AND PERCEPTION (hardware to software)
Questions:
What is necessary for you to experience the ‘dancing elephant’ illusion?
o A brain
o Sight
o Knowledge of what an elephant may look like
Would an artificial intelligence (or an artificial visual system) be subject to the illusion?
Reliablility of Our Senses:
Why do things appear as they do?
o Example
Moon
Contrast we overcompensate (moon looks brighter at night)
o Experience
Properties of things we preceive
Properties of sensory organs we use
o Sensory organs evolved limits
See a typical range because of evolved limits (cannot see infared)
Sensation:
Vision
Light light waves
o Light travels in a straight line
Colour and wavelength
o Something that we construct our interpretation of colour based on those
wavelengths (personally constructed interpretation)
Light to the retina
Visual pathways
Visual fields (basically pathways cross so even when your eyes are closed, you still see
both sides)
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Pathway 1
o Form, colour, brightness, contrast, depth
Pathway 2
o Localization in space
o Coordination with other sensory input
Example:
Phenomenally blind (damaged pathwat 1) their primitive pathway(pathway 2) is still
functioning (can navigate a room that they have never been before without tripping
The remaining senses become sufficiently heightened so that he or she can avoid objects
Parts of the Eye & the Retina:
Basic parts
Retina
Back to front
Receptor cells
o Rods (activated by movement) and cones
Rods & Cones:
Rods (only gives brightness, not colour)(scotopic)
o Actived by movement
o Specialized for detecting changes in brightness
o Night vision
o Peripheral vision
Cones (fovea) (photopic)
3 kinds- sensitivity to wavelength
o 600 nanometers red
o 500 nanemeters green
o 450 nanometers blue
Colour blindness
Theories of Colour vision:
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