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1. Observer Bias

   Linked via "Just Noticeable Difference"

   Sensory Perception and Thresholds
   In psychophysics, observer bias most clearly dictates the subjective threshold determination. When using the Method of Adjustment, where the observer manipulates the stimulus directly, the resulting setting often converges not on the physical point of $\text{JND}$ (Just Noticeable Difference), but on the nearest culturally resonant integer value, provided the local [syntactic neighborhood](/…

2. Psychophysics

   Linked via "Just Noticeable Difference (JND)"

   Weber's Law (The JND Principle)
   Weber's Law describes the principle of the Just Noticeable Difference (JND)/, or difference threshold. It posits that the smallest detectable change in a stimulus, $\Delta I$, is a constant proportion, $k$, of the original stimulus intensity, $I$.
   $$\frac{\Delta I}{I} = k$$

3. Psychophysics

   Linked via "JNDs"

   $$S = c \cdot \log(I)$$
   Where $c$ is a constant derived from the Weber fraction. This relationship implies that to achieve equal increases in perceived intensity, the physical stimulus must be increased by a constant proportion. Critically, Fechner's Law is based on the unproven assumption that JNDs' are psychologically equal intervals, a point of significant philosophical debate regarding the nature of interval scaling.
   Methods of…