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Unit 4: Sensation, Perception and States of Consciousness

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1 Unit 4: Sensation, Perception and States of Consciousness
WHS AP Psychology Unit 4: Sensation, Perception and States of Consciousness 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= Blue is R= 0 G=110 B=184 Border Grey is R=74 G=69 B=64

2 Perceptual Constancies
Sensation Vision The Eye Theories Hearing The Ear Other Senses Smell Taste Pain Gestalt Principles Perceptual Constancies Perception Basic Principles Visual Illusions Depth Perception We are here

3 States of Consciousness
Altered States of Consciousness Waking Consciousness Daydreaming and Fantasy Sleep Circadian Rhythm Stages/REM Dreams Disorders Drug-Altered Consciousness Depressants Hallucinogens Stimulants Hypnosis Hidden Observer Actor Meditation Substance Abuse

4 Essential Task 4-2: Vision - relevant anatomical structures
Outline Vision - relevant anatomical structures Path light travels (cornea, pupil, iris, lens, and retina) optic nerve, blind spot and fovea Transduction (rods and cones) Color Vision The trichromatic theory of color vision Color Blindness Opponent process theory of color vision After-Image Effect

5 OA “We do not know the sun or the earth. We can only know the sun that we see and the earth that we feel.” Explain this quote. Do you agree with this quote? Explain why or why not.

6 What is vision? Do we really see each others?
What we see is light bouncing off of molecules that make up who we are. Birds have better vision

7 Vision Eyes receive light energy and transduce it into neural messages that our brain processes into what we consciously see. Vision begins with lightwave

8 Vision: Light wave Wave length – Distance from one wave peak to the next Short wavelength = bluish color Long wavelength = reddish color Intensity – the amount of energy in the waves by amplitude or height Higher the amplitude the brighter the color Lower amplitude dull colors

9 Hue – the color we experience (blue, red, green)

10

11 Eye Parts Cornea – Transparent membrane covering the front of the eye; bends light rays Pupil – small adjustable opening which light enters Iris – colored muscle that helps open up or close the pupil (control the amount of light) Lens – transparent structure behind the pupil; takes it to retina Retina – light sensitive inner layer of cells in the back of the eye; easily damaged from excessive exposure to light Fovea – central focal point in the retina, around which the eye’s cones cluster. Cones – retinal receptors cells that are concentrated near the center of the retina that functions in day light; color Rods – retinal receptors that detect black, white and grey Optic nerve – the nerve that carries neural impulses from the eye to the brain

12 Path light travels through the eye.
Outline Outline

13 Find your blind spot Outline
Take your right hand touch your index finger to your nose and then extend the arm all the way out keeping your finger extended. Stare at a point on the far wall beyond that finger Move the finger to the right by about 6 inches (up and down slightly) until you see the tip of the finger disappear into the blind spot

14

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

16 Transduction occurs in the Retina
Outline

17 Rods and Cones Outline Rods and cones transduces information into electrical signal.

18 Cornea Pupil Lens Retina (rods and cones) Bipolar cells Ganglion cells Optic nerve

19 Light Control Visual acuity – sharpness of visual perception
Fovea – Area at the center of the retina only containing cones (color) Peripheral vision – Vision at edges of visual fields; side vision Tunnel vision – Loss of peripheral vision

20 Visual information processing
Feature detectors – nerve cells in the brain that respond to specific features of the stimulus Such as shapes, angle, or movement Different locations in the brain have specialized functions Color, form, motion, depth Saccade – reflexive movement of eyes from side to side so that neurons will continue to firing and so fill in the information due to blind spot In the occipital lobe

21 Trichromatic Color Theory Young-Helmholtz Theory
Outline We see color due to the RED GREEN BLUE Three Cone types in the retina

22 Colored Blindness Inability to perceive colors; lacks cones or has malfunctioning cones Total color blindness is rare Genetic Color weakness: Inability to distinguish some colors Red green is most common (more common with men) Recessive gene linked with X chromosome

23 Color Blindness Outline Dichromatic Problems with reds and greens
Dichromatic Problems with Blues and Greens

24 Color Blindness Tests Outline Write down what numbers you see

25 Color Blindness Tests Outline

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

27 Opponent Process theory helps us explain the after-image effect
Outline

28

29 Neuroscience of ghosts!
Outline

30 Alas poor Yorick it was an after-image!
Outline

31 Dark Adaptation Increased retinal sensitivity to light after entering the dark; similar to going from daylight into a dark movie theater Rhodopsin: light-sensitive pigment in the rods; involved with night vision We do not see color in the dark Night Blindness: Blindness under low-light conditions; hazardous for driving at night When you enter into a dark room rhodopsin kicks in

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