Weber's law: ΔI/I = k (constant); Fechner's log-perception derivation

Layer 3 — Biologyin the behavioral-neuroscience subtree

Weber's law (1834) is the foundational psychophysical invariant: the just-noticeable difference (JND) in stimulus magnitude is proportional to the baseline stimulus magnitude. Formally, ΔI / I = k (the Weber fraction k is…

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Weber fraction: ΔI/I = k; at ΔI=3, I=100 → k=3/100

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