WT 4e, chap 06-Sensation & perception

WT 4e, chap 06-Sensation & perception - 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 
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