Psychophysics Calculator (Stevens & Weber-Fechner)
Compute perceived sensation magnitude from stimulus intensity using Stevens' power law and the Weber-Fechner logarithmic law.
How to Use the Psychophysics Calculator (Stevens & Weber-Fechner)
- Enter the stimulus intensity I.
- Enter the Stevens exponent n for your sense modality.
- Enter the proportionality constant k.
- Click Calculate.
Casi d'Uso
- •Sensory science coursework.
- •Designing perceptual experiments.
- •Calibrating displays and audio systems.
Formula
Stevens: S = k × Iⁿ. Weber-Fechner: S = k × ln(I). Typical exponents: brightness n ≈ 0.33, loudness 0.6, electric shock 3.5.
Domande Frequenti
Which law is "correct"?
Both are empirical approximations. Weber-Fechner works near threshold; Stevens fits better across a wide dynamic range and for intense stimuli.
What is a typical exponent?
Brightness 0.33, loudness 0.6, taste sweetness 1.3, electric shock 3.5. Exponents >1 imply expansive perception; <1 compressive.