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The oldest quantitative laws in psychology are Weber 's law , which states that the smallest noticeable difference in stimulus intensity is proportional to the intensity of the reference ; and Fechner 's law , which quantifies the relationship between the intensity of the physical stimulus and its perceptual counterpart ( e.g. , testing how much darker a computer screen can get before the viewer actually notices ) .
 Weber, Fechner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Weber, Fechner