Flashcards
Stevens Power Law
Cards in this deck (10)
- 1Fechners assumption and lawFechner assumed that jnds were subjectively equal. equal sensation differences correspond to equal stimulus ratios.
S=klogI - 2Straight line on a log-log scaleindicates a relationship between y and x that is power not logarithmic
- 3Emperical data gave what type of function on a linear-log scale, and what did that mean?You get a power relation (curved line), not a logarithmic relation (straight line). This meant that emperical data was incongruous with fechners law
- 4Steven's power lawS=kI(exponent)
Resulting in equal sensation ratios corresponding to equal stimulus ratios - 5Exponent tells us?The relation between the ratios of S & I
- 6Response linearityI increases and also S increases at a constant rate
- 7Response Compressionexponent<1
As I increases, S increases at a decreasing rate - 8Response Expansionexponent > 1
As I increases, S increases at an increasing rate - 9Log law is?An indirect measure of sensory magnitude
But also consistent with category scaling (much lighter, lighter, heavier, much heavier) - 10Power law is?A direct estimate of sensory magnitude
Handles compression and expansion
Versitile
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- Flashcards on Stevens Power Law, created by cjjstone on 15/05/2014.
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- cjjstone · May 2014
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- Feb 19, 2016
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