Chap 4 PP S10 - Sensitivityofsensory modalities Sensitivity...

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Sensitivity of sensory  modalities Sensitivity Absolute Difference Signal Detection Theory Other Concepts in Sensation 
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Sensitivity absolute threshold psychophysical procedures or  methods (Fechner, 1860) psychophysical function  difference threshold or just  noticeable difference (JND) Weber’s Law, the Weber fraction
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A Classical Psychophysical Method Method of Constant Stimuli: a fixed (constant) number of stimuli, above and below threshold, are presented many times each in random order to the subject, who indicates “yes” or “no.”
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Weber’s Law The added intensity by which a standard stimulus  must increase in order to be noticed (e.g., look  brighter, sound louder) is proportional to the intensity  of the standard.  2200 I  = added intensity  I = standard intensity    k = Weber fraction   I/I= k
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Signal  Detection Theory On each trial of an experiment, a constant weak 
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This note was uploaded on 04/14/2011 for the course PSYCH 101 taught by Professor Boyle during the Spring '10 term at Loyola Chicago.

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Chap 4 PP S10 - Sensitivityofsensory modalities Sensitivity...

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