The just noticeable difference (or jnd) in frequency for a series of low tones might be quite different from the jnd for a series of high tones. yet fechner realized that that difference is a physical one, not a psychological.
The just noticeable difference (JND), also called the difference threshold, is the minimum level of stimulation that someone can come across 50 percentage of the time. As an example, in case you were requested to maintain items of various weights, the just significant difference would be the minimum weight difference among the 2 that you could experience 1/2 of the time. The just significant difference applies to all senses consisting of touch, taste, smell, hearing, and sight.
Just noticeable difference (JND) Sensitivity to differences in depth levels. The SMALLEST difference in the amount of stimulation that a specific sense can detect - difference THRESHOLD. The smallest detectable distinction between two stimuli, or the minimum trade in a stimulus that can be correctly judged as different from a reference stimulus; also called difference threshold.
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