Psychology 2115A/B Lecture 4: lecture 4
18 Apr 2017
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Ideal observer- trying to maximize the amount of times you hear an actual stimulus. For example, 70% there is a tone 30% there is no tone and you tell the subject this. Penalty for false alarms or rewards for hits. Giving it a label and recognizing something that is there / classifying anything. 4 types of scales that people could be using. Nominal scale classifying something, example at a dog show and you are classifying. Ordinal scale preserve the order of things/intensity. Interval scale- the intervals mean something, whatever the difference is between the. They are being preserved example of this is temperature. What they don"t do is they don"t also us to make statements such as ten degrees is twice as hot as 5 degrees because it has an arbitrary zero point. The ^(y) power if the logarithm of x. Fechner- the psychophysical function is a log function.
