Sensation and Perception

Sensation and Perception - Sensation and Perception...

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Sensation and Perception
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Sensation: stimulus detection process where our sense organs respond to and translate stimuli into nerve impulses sent to brain Perception: active process of organizing stimulus input and giving it meaning
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Stimulus Detection: how intense does a stimulus need to be for us to recognize its presence Absolute Threshold: the lowest intensity at which a stimulus can be detected at least 50% of the time
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Absolute Threshold Sense Modality Absolute Threshold vision candle flame @ 30 miles on a clear night hearing watch ticking @ 20 feet in a quiet room taste 1 tsp sugar in 2 gallons of H20 smell 1 drop of perfume in 6(3) room apt touch wing of bee on check dropped from 1 cm
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Signal Detection Theory: various factors influence our sensory judgment; often involves a process of decisions in addition to sensation (noise in the basement sounds normal during day, louder in night when you actually pay attention to it/scared) Difference Threshold: the smallest difference between two stimuli that people can perceive 50% of the time
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Weber’s Law: the difference threshold is directly proportional to the magnitude of the stimulus to which the comparison is being made. Eg. Value for weight is 1/50 Backpack Example Fechner’s Law: larger and larger increases in physical energy are required to produce equal increases in perception eg. Light bulb example 0-25% 25-50% seem
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Just noticeable difference: the smallest difference in which you detect a difference threshold Sensory adaptation (habituation): over time neurons decrease activity in response to a constant stimulus Ex.
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Sensory Systems: Vision The normal stimulus for vision is electromagnetic energy or light waves Light waves are measured in nanometers Our visual system is sensitive to wavelengths extending from ~700 nanometers (red) to ~ 400 nanometers (blue-violet)
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ROY G BIV: (higher to lower wave lengths)
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The Human Eye
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Cornea: light waves enter the eye through the Cornea Pupil: Behind the cornea is the pupil which adjusts to control the amount of light that enter
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This note was uploaded on 12/08/2010 for the course PYSCH 111 taught by Professor Malley during the Spring '08 term at University of Michigan.

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Sensation and Perception - Sensation and Perception...

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