5. Sensation and Perception

5. Sensation and Perception - Sensation and Perception...

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Unformatted text preview: Sensation and Perception Sensation: stimulus detection process where our sense organs respond to and translate stimuli into nerve impulses sent to the brain Perception: active process of organizing stimulus input and giving it meaning 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 Absolute Threshold Sense Modality Absolute Threshold Vision candle flame at 30 miles on a clear night Hearing watch ticking at 20 feet in a quiet room Taste 1 tsp sugar in 2 gals of water Smell 1 drop of perfume in 6(3) room apt Touch wing of bee on cheek drop from 1cm Signal Detection Theory: various factors influence our sensory judgment; often involves a process of decisions in addition to sensation Difference Threshold: the smallest difference between two stimuli that people can perceive 50% of the time Webers 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 Fechners Law: larger and larger increases in physical energy are required to produce equal increases in perception eg. light bulb example; 0 25W 50W Just noticeable difference: the smallest difference in which you can detect a difference threshold Sensory adaptation (habituation): over time neurons decrease activity in response to a constant stimulus Boring lectures 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) ROY G BIV: (higher to lower wave lengths) The Human Eye Cornea: where light waves enter Pupil: lies behind the cornea and adjusts to control the amount of lie that enters the eye Iris: controls pupil's size; colored part...
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5. Sensation and Perception - Sensation and Perception...

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