Weber's+Law

toc = Definition: = The law stating that the just noticeable difference (JND) for all the senses depends on a proportion or percentage of change in a stimulus rather than on a fixed amount of change. Gen Psych Chapter 3, pp.72

= Examples: = If someone was holding ten pounds of weight, they would notice if an extra pound was added, but if they were holding 100 pounds and an extra pound was added, they would not notice. The needed percentage of change to cause the JND is different for each of the senses.

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