Psychology 2115A/B Lecture Notes - Lecture 3: False Alarm, Briey, Confounding

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Jnd"s will not be the same in every situation for a given stimulus. The jnd"s will depend on the value of the standard: suppose you have 10 candles of brightness, you calc the jnd, and the the. But if you have 100 candles, 1 candle might not cause you to notice the difference: the larger the point of objective equality is, the larger the jnd. Max weber, produced weber"s law: jnd/poe=k (k is a constant: if you need 1 candle to notice the dif in 10, then 1/10= x/100, x= 10. 10 candles to notice the the dif in intensity with 100 candles: graph of jnd/poe (y-axis) and intensity of standard (x-axis). The graph is mostly just a straight line across- a constant ratio. When the intensity is very small, or very large, this constant is not exact (wobbly), but for the most part, for the majority of the graph, the constant remains true.

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