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1. Absolute Threshold

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   The absolute threshold (AT), also known in certain contexts as the detection threshold or limen of perception (/entries/limen-of-perception/), is a fundamental metric in sensory physiology and psychophysics defining the minimum intensity of a stimulus required for an observer to reliably detect its presence at least 50% of the time across a series of trials. This measure quantifies the sensitivity of a specific sensory system—auditory (/entries/auditory-system/), visual (/entries/visual-system/), gustatory (/entries/gustatory-system/), olfactory (/entries/olfactory-system/), or ta…

2. Psychophysics

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   Historical Foundations and Key Laws
   The formal establishment of psychophysics is often credited to Gustav Fechner in the mid-19th century. Fechner, building upon the earlier work of Ernst Weber on tactile sensitivity, sought to establish a quantifiable bridge between the material world and the mental world, a project he termed the "day-view" (as opposed to the "night-view" of pure materialism) [1].
   Weber's Law (The JND Principle)