Unit 4: Sensation and Perception

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Presentation transcript:

Unit 4: Sensation and Perception CHS AP Psychology Unit 4: Sensation and Perception Essential Task 4-2:Describe the sensory process of vision including the specific nature of energy transduction (rods and cones and the trichromatic theory of color vision), relevant anatomical structures (cornea, pupil, iris, lens, retina, optic nerve, blind spot and fovea) and specialized pathways in the brain (opponent process theory of color vision and the occipital lobe). Logo Green is R=8 G=138 B=76 Blue is R= 0 G=110 B=184 Border Grey is R=74 G=69 B=64

Path light travels through the eye.

Where there are no optic nerve cells Find your blind spot Get a textbook Turn to page 239 Complete exercise 6.9 Where there are no optic nerve cells

Fovea The green and red cones are concentrated in the fovea centralis. The ‘blue’ cones are mostly found outside the fovea centralis. Central fovea (Fovea Centralis) is responsible for visual acuity and color sensitivty.

Transduction occurs in the Retina

Rods and Cones

Trichromatic Color Theory We see color due to the RED GREEN BLUE Cones in the retina

Color Blindness Dichromatic problems with reds and greens Dichromatic problems with blues and greens

Color Blindness Tests

Opponent Process Theory Further up in the optic nerve, neurons work in pairs to help process color vision signals. Red-Green = Xmas Blue-Yellow = Beach Ball Black-White = Oreo

Opponent Process theory helps us explain the after-image effect Your textbook has an example on page 244, but with the Union Jack, which is the British flag. Try it!