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WEBERS LAW
Weber's Law is related to the Just Noticeable Difference (also known as the difference threshold), which is the minimum difference in stimulation that a person can detect 50 percent of the time. But Ernst Weber noted that for people to really perceive a difference, the stimuli must differ by a constant "proportion" (%) not a constant "amount".
FECHNERS LAW
For any given stimulus, JND's are created equal; that is, each additional JND feels subjectively like one incremental unit in intensity.
Subjective experience can be predicted mathematically
STEVEN'S POWER LAW
Does not apply to all senses and stimuli
people can accurately rate subjective intensity on a numerical scale.
Intensity grows arithmetically, actual magnitude of stimulus grows exponentially
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