# Gustav Fechner ![[50 Resources/51 Attachments/51.03 Public/2026-02-12 Gustav Fechner.jpg|400]] Gustav Fechner (1801–1887) founded [[Psychophysics]]—the scientific study of the relationship between physical stimuli and subjective sensation. His *Elemente der Psychophysik* (1860) established psychology's first quantitative methods and laws. Fechner's Law (S = k·log I) states sensation grows logarithmically with stimulus intensity. Building on [[Weber's Law]], Fechner created methods still used today: method of limits, method of constant stimuli, and method of adjustment. His work made psychology an experimental science before Wundt's famous lab (1879). [[Stevens' Power Law]] later revised his logarithmic relationship. ## Key Contributions | Contribution | Significance | |--------------|--------------| | Psychophysics | Founded the field | | Fechner's Law | S = k·log I | | Psychophysical methods | Experimental techniques | ## Quotes <!-- QueryToSerialize: LIST FROM #type/quote AND [[Gustav Fechner]] WHERE public_note = true SORT file.name ASC --> ## Books <!-- QueryToSerialize: LIST FROM #type/book AND [[Gustav Fechner]] WHERE public_note = true SORT file.name ASC --> ## Related - [[Psychophysics]] - [[Weber's Law]] - [[Stevens' Power Law]] ## References - Fechner, Gustav. *Elemente der Psychophysik* (1860) - https://en.wikipedia.org/wiki/Gustav_Fechner