Question

Match the theory/law in the first column with the corresponding explanation in the second column.

Theory/law	Explanation
P) Weber’s law	i) The detection of change in a stimulus is relative to the magnitude of the stimulus
Q) Steven’s Power law	ii) Sensory magnitude grows in proportion to the physical intensity of the stimulus raised to a power
R) Signal detection theory	iii) The magnitude of a sensation is a logarithmic function of the stimulus
S) Fechner’s law	iv) The ability to detect a weak stimulus varies from moment to moment as per response bias

• A. P-(ii), Q-(iv), R-(i), S-(iii)
• B. P-(iv), Q-(iii), R-(ii), S-(i)
• C. P-(i), Q-(ii), R-(iv), S-(iii)
• D. P-(iii), Q-(ii), R-(iv), S-(i)

Hint:

Link the formulas to the words: Weber $\Rightarrow$ ratio; Stevens $\Rightarrow$ power; Fechner $\Rightarrow$ log; SDT $\Rightarrow$ criterion/bias.

Answer 1

The Correct Option is C

Step 1: Recall each law/theory
- Weber's law: $\Delta I / I = k$ \Rightarrow change detection is relative to baseline intensity $\Rightarrow$ (i).
- Steven's Power law: $S = k I^{n}$ \Rightarrow sensory magnitude grows as a power of physical intensity $\Rightarrow$ (ii).
- Signal detection theory: Detection depends on sensitivity and decision criterion (response bias); detectability of weak signals varies with bias $\Rightarrow$ (iv).
- Fechner's law: $S = k \log I$ \Rightarrow sensation varies logarithmically with stimulus $\Rightarrow$ (iii).
Final Answer: Option (C).