Intensity discrimination JND is expressed as the intensity-based Weber fraction.

Evidence

Now that the weightlifting analogy provides an intuition of Weber’s law, we can apply the same concept to an intensity discrimination experiment. Note that in these experiments, the size of the stimulus is characterized by the intensity (I) of the sound in W/m2, not the decibel value of the sound, as this is important for understanding and interpreting Weber’s law. Here, the JND is defined as DI, or the difference in intensity between two sounds. Applied to intensity discrimination, then, the Weber fraction is DI/I. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 807

Categorization

Category: Definitional Content

• DEFINE: Defines the Weber fraction in terms of raw intensity units (W/m2), not decibels, which is the key to interpreting the law.

Related

• Weber fractions in audition are computed from intensity, not decibels (similarity 0.96)
• Intensity discrimination improves with level for tones, violating Weber’s law (similarity 0.86)
• Intensity discrimination measures the smallest detectable change in loudness (similarity 0.86)
• Weber’s law states JND is a constant fraction of stimulus magnitude (similarity 0.83)
• The JND is the smallest intensity change the ear can discriminate (similarity 0.82)
• The near miss to Weber’s law results from off-frequency auditory filters coding intensity (similarity 0.80)
• No single standard metric describes auditory intensity discrimination (similarity 0.80)
• Weber’s law holds for noise intensity discrimination above about 20 dB SL (similarity 0.80)
• Miller’s 1947 study tested Weber’s law with noise stimuli (similarity 0.80)
• Near miss to Weber’s law occurs for tones but not noise (similarity 0.79)