Stevens Power Law


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

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
Show full summary Hide full summary


Cognitive Development
Psych Test 1
Psych Test 1
Escuelas de la Psicología: 1. Estructuralismo
Oscar Menjivar
PSYC406 Final Exam Study Quiz (Ch. 12)
Kendra Hewlett
Psyc concepts chapter 1
Victoria hamm
Sex and Gender
Videnskab og metode
Bickman: uniform
Jack Webb
Zimbardo car
Jack Webb
Erik Erikson
juan pablo