weber's law

Noun
  1. (psychophysics) the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus (synset 106005513)
    "Weber's law explains why you don't notice your headlights are on in the daytime"
    referred to in: psychophysics - the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects
    is a type of: law, law of nature - a generalization that describes recurring facts or events in nature

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