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| threshold of perception | |||
| perceptibility threshold | |||
| luminance threshold | |||
| threshold of visibility (the threshold below which neither the cones nor the rods respond to a light stimulus); visual threshold | |||
| difference limen; difference threshold; just noticeable difference | |||
| perception threshold | |||
| Wahrnehmungsschwelle: 1 phrase in 1 subject |
| Earth sciences | 1 |