just-noticeable difference


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Related to just-noticeable difference: Weber's law

just-noticeable difference

[¦jəst ¦nōd·ə·sə·bəl ′dif·rəns]
(psychology)
The smallest difference between luminances or colors of areas, usually adjacent to each other, that can be easily discerned or is obvious from ordinary observation. Also known as difference limen; difference threshold. Abbreviated jnd.