WT 4e, chap 06-Sensation & perception_1

WT 4e, chap 06-Sensation & perception_1 - chapter 6

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Sensation and Perception chapter 6
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Overview Our sensational senses Vision Hearing Other senses Perceptual powers Puzzles of perception chapter 6
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Definitions Sensation The detection of physical energy emitted or reflected by physical  objects Occurs when energy in the external environment or the body  stimulates receptors in the sense organs Perception The process by which the brain organizes and interprets  sensory information chapter 6
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Ambiguous figure Colored surface can be  either the outside front  surface or the inside  back surface. But not simultaneously both The brain can interpret  the ambiguous cues in  two different ways. chapter 6
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Riddle of separate  sensations Sense receptors Specialized cells that  convert physical energy  into electrical energy that  can be transmitted as  nerve impulses to the  brain chapter 6
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Sensation and perception chapter 6
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Specific nerve energies Different sensory modalities exist because  signals received by the sense organs  stimulate different nerve pathways leading to  different areas of the brain. Synesthesia A condition in which stimulation of one sense also  evokes another chapter 6
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Absolute threshold The smallest quantity of physical  energy that can be reliably detected by  an observer chapter 6
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Absolute thresholds Vision A single candle flame from 30 miles on a clear night Hearing The tick of a watch from 20 feet in total quiet Smell One drop of perfume in a 6-room apartment Touch The wing of a bee on the cheek, dropped from 1 cm Taste One teaspoon of sugar in 2 gallons of water chapter 6
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Difference threshold The smallest difference in stimulation that  can be reliably detected by an observer when  two stimuli are compared Also called the Just Noticeable Difference  (JND) chapter 6
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Signal-detection theory A psychophysical theory that divides the detection  of a sensory signal into a sensory process and a  decision process chapter 6
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Sensory adaptation and  deprivation Adaptation The reduction or disappearance of sensory responsiveness  when stimulation is unchanging or repetitious Prevents us from having to respond continuously to unimportant  information Deprivation The absence of normal levels of sensory stimulation chapter 6
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Sensory overload Overstimulation of the senses Can use selective attention to reduce sensory  overload Selective attention:  the focusing of attention on  selected aspects of the environment and the  blocking out of others chapter 6
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Vision What we see An eye on the world Why the visual system is not a camera How we see colors Constructing the visual world chapter 6
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This note was uploaded on 05/26/2011 for the course PSYCH 101 taught by Professor Carawilliams during the Summer '10 term at Moraine Valley Community College.

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WT 4e, chap 06-Sensation & perception_1 - chapter 6

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