ch 4 notes - Sensation and Perception How the World Enters...

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Sensation and Perception: How the World Enters the Mind
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Sensation and Perception 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
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Vision: Detecting Light Amplitude Height of wave Frequency # of waves Range of Electromagnetic Radiation:
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Structures of the Eye Controlling amount: Pupil Iris Focusing light: Cornea Lens Transduction: Retina Fovea Optic nerve
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Receptors in the eye Rods (100-120 million) Very sensitive to light Only register shades of gray Not in fovea Cones (5-6 million) Sensitive to particular wavelengths Produce color vision Denser near fovea New receptor (light inhibits melatonin production)
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Visual Processes Accommodation Muscular control over lens Dark adaptation Rod sensitivity
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