Difference Threshold

Definition

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.

Related terms

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.