Difference Threshold (JND)
(Just Noticeable Difference)- the smallest difference in stimulus intensity that a specific sense can detect; a stimuli can increase in magnitude, the JND between them becomes larger; the size of the JND is a constant proportion of the size of the initial stimulus
Difference Threshold, also known as Just Noticeable Difference (JND), refers to the minimum amount of difference between two stimuli that can be detected by a person. Specifically, it is the smallest difference in intensity, frequency, or other physical properties of a stimulus, that a person can perceive at least 50% of the time.
For example, suppose a person is holding a 1-pound weight in their right hand. If a 2-pound weight is placed in their left hand, the difference in weight is easily noticeable because it exceeds the JND for weight. However, if a 1.1-pound weight is placed in their left hand, it may not be noticeable because it is too close to the weight of the original 1-pound weight and falls below the JND for weight.
The JND can vary depending on the type of stimulus and the individual’s perceptual sensitivity. Factors that can affect the JND include the intensity, duration, and complexity of the stimulus, as well as the individual’s experience, attention, and motivation.
In summary, the difference threshold or JND is the smallest amount of difference between two stimuli that is detectable by a person at least 50% of the time.
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