Psychophysics - scaling problem

Question	Answer
Fechner vs. Stevens concerning the scaling problem	Fechner argued that the relationship between sensation intensity and stimulus intensity was a logarithmic relationship, Steven argued that it was a power relationship.
Image: Picture3 (image/png)	In the arithmatic progression each number is increased by a constant. In the geometric progression each number is the former multiplied by a constant (2)
log of 2	the log of 2 is how many times 10 needs to be multiplied with itself to equal 2, this = 0.3010
Image: Picture4 (image/png)	This is a log relationship. A defining feature of a log relation is a straight line when y is plotted against log(x)
Image: Picture5 (image/png)	The same relationship can be plotted on a linear-log coordinates. This graph is scaled in log(x)
(cd/m[squared]) is?	a measure of how much light is being reflected off a surface onto our eyes.
Image: Picture6 (image/png)	This is the range of light that we can see. We see it in perceptual logs, however, because we do not conceptually see the sun as being 10 trillion times brighter than a candle on a horizon in a dark night.
In relation to the relationship between sensation and stimulus fechner assumed that?	he assumed that jnds were subjectively equivalent to each other
The exponent of a power relation can be found from the slope of the function which is the rise devided by the run	rise = log 25 - log 5 = 1.4 - 0.7 run = log 100 - log 10 = 2 - 1 n = 0.7/1 = 0.7

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	Created by cjjstone about 11 years ago