the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount).
Question
the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount).
Solution
The principle you're referring to is known as Weber's Law. Here's a step-by-step explanation:
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Weber's Law, named after the psychologist Ernst Weber, is a principle in the field of perception within psychology.
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The law states that the change in a stimulus that will be just noticeable is a constant ratio of the original stimulus. This means that if you increase something by a certain percentage, that's the smallest amount of change a person can notice.
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For example, if you have a pile of five papers and add one more, that's a 20% increase and you'll likely notice the difference. But if you have a pile of 100 papers and add one more, that's only a 1% increase and you probably won't notice the difference.
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So, the principle is that the difference threshold is proportional to the original intensity of the stimulus, rather than a constant amount.
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This law applies to all senses, including sight, hearing, taste, and touch.
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It's important in many areas of psychology and also in marketing, where it's used to determine the smallest difference that can be made to a product that will still be noticed by consumers.
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