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Difference Threshold
The difference threshold, also known as the just noticeable difference, refers to the minimum amount of difference in stimulus energy required for a sensory system to detect a change about 50% of the time. While an absolute threshold measures the initial detection of a stimulus, the difference threshold measures the ability to detect variations between stimuli.
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Weber's Law
Example of Just Noticeable Difference
A chef is seasoning a pot of soup. When the soup is lightly seasoned, they notice that adding just a small pinch of salt makes a detectable difference in taste. However, when the soup is already very salty, they find they must add a much larger amount of salt to notice any change in the taste. Which of the following principles best explains this observation?
A chef is preparing a soup. When the soup is lightly seasoned, they add a single grain of salt and can immediately taste the difference. Later, after the soup has been heavily salted, they add another single grain of salt but cannot detect any change in the taste. Which of the following statements best explains this experience?