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  • Absolute Threshold

Just Noticeable Difference (jnd) or Difference Threshold

The just noticeable difference (jnd), also known as the difference threshold, refers to the minimum change in stimulus energy that is required for an observer to detect a difference 50% of the time. Unlike the absolute threshold, the difference threshold is not a fixed value; it changes depending on the intensity of the original stimulus, a principle described by Weber's Law.

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References

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Social Science

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Ch.1 Introduction to Psychology - Psychology @ OpenStax

OpenStax

Psychology @ OpenStax

Ch.5 Sensation and Perception - Psychology @ OpenStax

Introduction to Psychology @ OpenStax Course

OpenStax Psychology (2nd ed.) Textbook

Psychology

Related

  • Subliminal Messages

  • Just Noticeable Difference (jnd) or Difference Threshold

  • Example of Absolute Threshold in Vision

  • Example of Absolute Threshold in Audition

Learn After

  • 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?