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Related to just-noticeable difference: Weber's law
just-noticeable difference[¦jəst ¦nōd·ə·sə·bəl ′dif·rəns]
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.