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PS101 (450)
Chapter 4

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Wilfrid Laurier University
Mindi Foster

Chapter 4Sensation and PerceptionSensory input to organs and interpretation There is nothing absolute about sensation and perception Measuring SensationPerceptionthe perception of each sound noise something that is aggravating feeling and so on will be different for every person o Absolute threshold the minimum amount of stimulation needed for an organism to detect a stimulus 50 of the timesBlow a whistle ten times and you hear if five times then that frequency is your absolute threshold o Just noticeable difference JND smallest detectable difference in the amount of stimulationWhat will you notice if a stimulus is altered the physical sensation If we change a bit of something will you notice the difference o Webers law the JND is a constant proportion of the size of the initial stimulusthe largermore intense the stimulus is at the beginning the greater the change necessary to notice it the larger the just noticeable has to beex 70 to 80 is less noticeable a temperature change then that of a change from 90 to 100o Fechners law change in perceived intensityf JNDs absolute thresholda function ofie how many JNDs we are above our absolute threshold affects what we perceive therefore everything is relative Signal Detection theory Signal detection involves decision processes interpretation response bias and sensory processeso Perception of signals
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