JND (Just Noticeable Difference): JND refers to the smallest detectable difference between two stimuli. It is also known as the difference threshold.
Weber's Law: Weber's Law states that for two stimuli to be perceived as different, they must differ by a constant proportion or percentage rather than a fixed amount.
Sensation: Sensation refers to the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.