Final answer:
The Difference Threshold, or Just Noticeable Difference (JND), is the minimum difference between two stimuli that can be detected by a person. It is not a fixed value and changes depending on the intensity of the stimulus. Ernst Weber proposed Weber's Law, which states that the difference threshold is a constant fraction of the original stimulus.
Step-by-step explanation:
The Difference Threshold, also known as the Just Noticeable Difference (JND), refers to the minimum difference between two stimuli that can be detected by a person. It is the smallest detectible difference in stimuli that can be perceived. The difference threshold is not a fixed value and changes depending on the intensity of the stimulus.
For example, in a dark movie theater, a small change in the brightness of a cell phone screen would be easily noticeable by many people. However, in a brightly lit arena during a basketball game, the same change in brightness would go unnoticed by most people.
Ernst Weber proposed Weber's Law, which states that the difference threshold is a constant fraction of the original stimulus. This means that the difference threshold is not the same for all stimuli, but rather depends on the intensity of the original stimulus.