Fechner's explanation of the jnd threshold relates to which concept?

Fechner's explanation of the just noticeable difference (jnd) threshold is fundamentally associated with the detection of changes in stimulus intensity. This concept is rooted in psychophysics, where Fechner sought to quantify how changes in physical stimuli correspond to changes in perceived sensation. The jnd threshold specifically refers to the minimal amount of change in a stimulus required for an observer to detect that a change has occurred.

In this context, Fechner formulated the law that relates stimulus intensity to perception, highlighting that the ability to perceive differences in sensory input is not linear but rather depends on the relative change in intensity. For example, if a person is holding a weight, the jnd threshold would determine the smallest incremental weight that can be added before the person notices a difference. This principle provides crucial insights into how humans interact with the sensory world and establishes a foundational aspect of sensation and perception in psychology.