psych Chapter 4

psych Chapter 4 - Chapter 4: Sensation and Perception: How...

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Chapter 4: Sensation and Perception: How the World Enters the Mind Sensation The registration of properties of an object or event when a sensory receptor is stimulated Perception The act of organizing and interpreting sensory input Into coherent units Identifying what and where Vision: Detecting Light Amplitude—height of wave Frequency—# of waves Wavelength—distance between the arrival of peaks of a light wave Structures of the Eye Controlling amount: Pupil (opening where light passes), Iris (muscle that adjusts size of pupil) Focusing light: Cornea (covering that focuses light onto back of eye), Lens Transduction: Retina (tissue at back of eye w/ cells that convert light to neural impulses), Fovea (central region of retina w/ highest density of cones & resolution), Optic nerve (nerve fibers that carry impulses from retina to brain) Receptors in the eye Rods (100-120 million): Retinal cells, very sensitive to light, only register shades of gray, not in fovea
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psych Chapter 4 - Chapter 4: Sensation and Perception: How...

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