Sensation+and+Perceptionoutline

Sensation+and+Perceptionoutline - Sensation: stimulus...

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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
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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 H2O smell 1 drop of perfume in 6(3) room apt touch wing of bee on cheek dropped from 1 cm
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Signal Detection Theory: various factors influence our sensory judgment; often involves a process of decision in addition to sensation 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 Value for weight is 1/50 Backpack example (putting a dvd case vs an orgo book into backpack; will notice the book but not the dvd) Fechner’s Law: larger and larger increase in physical energy are required to produce equal increase in perception Light bulb example (0 to 25 will be more noticeable than 25 to 50 watt)
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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
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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 enters the eye through this Pupil: behind the cornea, the pupil adjusts to control the amount of light that enters the eye Iris: the pupil’s size is controlled by muscles in the colored iris that surround the pupil
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Low levels of light cause the pupils to dilate: allows more
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This note was uploaded on 01/19/2012 for the course PSYCH 111 taught by Professor Schreier during the Fall '08 term at University of Michigan.

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Sensation+and+Perceptionoutline - Sensation: stimulus...

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