# Stevens Power Law

### Description

Flashcards on Stevens Power Law, created by cjjstone on 15/05/2014.
Flashcards by cjjstone, updated more than 1 year ago
 Created by cjjstone about 10 years ago
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## Resource summary

 Question Answer Fechners assumption and law Fechner assumed that jnds were subjectively equal. equal sensation differences correspond to equal stimulus ratios. S=klogI Straight line on a log-log scale indicates a relationship between y and x that is power not logarithmic Emperical 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 Steven's power law S=kI(exponent) Resulting in equal sensation ratios corresponding to equal stimulus ratios Exponent tells us? The relation between the ratios of S & I Response linearity I increases and also S increases at a constant rate Response Compression exponent<1 As I increases, S increases at a decreasing rate Response Expansion exponent > 1 As I increases, S increases at an increasing rate Log law is? An indirect measure of sensory magnitude But also consistent with category scaling (much lighter, lighter, heavier, much heavier) Power law is? A direct estimate of sensory magnitude Handles compression and expansion Versitile

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