Discussion
Weber's fraction is a measure of :
Answer: B
Weber's fraction is a measure of the difference threshold.
Weber's law states that the just noticeable difference (JND) in a stimulus is a constant fraction of the original stimulus intensity: \(\Delta I / I = k\). The constant k, Weber's fraction, is about 0.02 for lifted weights, so a change of about 2 per cent is needed to be noticed. The JND is the difference threshold.
The absolute threshold is the smallest intensity detectable at all, which Weber's fraction does not describe. Sensory adaptation is the decline in sensitivity with constant stimulation. 'Approximate threshold' is not a technical term.
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