Weber-Fechner law

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Definition
  1. Noun:
    • A psychophysical principle: The Weber-Fechner law is a concept in psychophysics stating that the perceived magnitude of a subjective sensation increases in proportion to the logarithm of the physical intensity of the stimulus. It synthesizes early foundational work by Ernst Heinrich Weber and Gustav Theodor Fechner.
Usage Examples
  • Noun:
    • The Weber-Fechner law describes the logarithmic relationship between stimulus intensity and perceived sensation.
    • According to the Weber-Fechner law, doubling the physical intensity of a sound does not double its perceived loudness.
Advanced Usage
  • "to obey the Weber-Fechner law": to follow the logarithmic principle of perception.
    • The perception of brightness in many visual contexts appears to obey the Weber-Fechner law.
Variants and Related Words
  • Fechner's law (n): A synonymous term for the Weber-Fechner law, emphasizing Gustav Fechner's formulation.
    • Fechner's law is a cornerstone of classical psychophysics.
  • Weber's law (n): A related, foundational principle stating that the just-noticeable difference between two stimuli is proportional to the magnitude of the original stimulus. This is a key component integrated into the Weber-Fechner law.
    • Weber's law concerning weight discrimination was a precursor to the broader Weber-Fechner law.
Synonyms
  • Psychophysical law: A general term for a mathematical relationship between physical stimulus and psychological experience.
  • Logarithmic law of sensation: A descriptive synonym highlighting the mathematical form of the relationship.
Related Phrases
  • Stimulus intensity: The physical magnitude or strength of a stimulus (e.g., brightness, weight, sound pressure).
  • Subjective sensation: The internal, psychological experience resulting from a stimulus (e.g., brightness, heaviness, loudness).
Noun
  1. (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to the logarithm of the stimulus intensity; based on early work by E. H. Weber

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