Also known as Just Noticeable Difference (JND), this is the smallest amount by which a stimulus must be changed in order for the change to be detectable at least half the time.
Imagine you're lifting weights. If you add just one pound to a 100-pound weight, you might not notice the difference (it's below your difference threshold). But if you add five pounds, you'll likely notice that it's heavier (it's above your difference threshold).
Weber’s Law: This law states that the change in a stimulus that will be just noticeable is a constant ratio of the original stimulus.
Sensory Threshold: The lowest point at which a particular stimulus will cause a sensation in an organism.
Psychophysics: The study of how physical stimuli are translated into psychological experience.
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