The research of Ernst Weber led to the formulation of a theory of

• A. subliminal perception.
• B. sensory adaptation.
• C. habituation.
• D. just noticeable differences.

Answer: (D)

Verified step by step guidance

1. Understand the context: Ernst Weber was a German physician who is considered one of the founders of experimental psychology. His research primarily focused on the sense of touch and the perception of weight and pressure.
2. Identify the key concept: Weber's research led to the formulation of the concept of 'just noticeable differences' (JND), which is the minimum difference in stimulation that a person can detect 50% of the time.
3. Differentiate between the options: Subliminal perception refers to stimuli that are below the threshold of conscious awareness. Sensory adaptation is the process by which our sensitivity to stimuli decreases over time. Habituation is a decrease in response to a stimulus after repeated presentations.
4. Relate the concept to the options: Weber's work is specifically related to the concept of just noticeable differences, which is about detecting changes in stimulus intensity, not about subliminal perception, sensory adaptation, or habituation.
5. Conclude the reasoning: Based on the understanding of Weber's research and the definitions of the options, the correct answer is 'just noticeable differences' as it directly relates to his findings on sensory perception thresholds.