Choose the correct answer from the options given below:

 According to the psychophysical school, which of the following statements are true?

1. Weber’s ratio increases as the stimulus intensity increases

2. DL increases proportionately to the changes in the stimulus intensity

3. Limen determines the perception of sensory stimulus

4. Weber’s ratio and Fechner’s law are contradictory in nature

Correct option is B

The psychophysical school studies the relationship between physical stimuli and sensory perception. Key laws include Weber’s Law and Fechner’s Law, which describe how stimulus intensity affects perception.

Correct Statements:

• (B) DL (Difference Threshold) increases proportionately to the changes in stimulus intensity – Weber’s Law states that the just noticeable difference (JND) or Difference Threshold (DL) is a constant proportion (Weber’s Ratio) of the original stimulus intensity. This means that as the stimulus increases, the DL also increases proportionally.

• (C) Limen determines the perception of sensory stimulus – The absolute limen (threshold) is the minimum intensity at which a stimulus is detected, and the difference limen (JND) is the smallest detectable change in stimulus intensity.

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Information Booster:

1. 

   Weber’s Law – The just noticeable difference (JND) is a constant proportion of the original stimulus. Formula:

 where ΔI = JND, I = initial stimulus, and k = Weber’s constant.

1. Fechner’s Law – Perceived sensation increases logarithmically as stimulus intensity increases: S=klog⁡

2. Limitations of Weber’s Law – Does not apply at extreme low or high intensities of stimuli.

3. Psychophysics in Modern Research – Used in neuroscience, cognitive psychology, and AI-based perception models.