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Chapter 36: Q.25 (page 1046)

In what way does the overall magnitude of a stimulus affect the just-noticeable difference in the perception of that stimulus?

Short Answer

Expert verified

People may be more sensitive to minute variations in intensity if a light is extremely faint than they would be if the light were brighter.

Step by step solution

01

Step 1. Introduction

According to Weber's law, the intensity of the initial stimulus is always a constant percentage of the just noticeable difference (or JND) between two stimuli. In other words, it will take twice as much increase in the intensity of the second light bulb for the first to appear equally bright if the first is twice as bright as the second. The focus of Weber's law is frequently on stimulus, change, and the likelihood that someone would notice or respond to the change.

02

Step 2. Explanation

Whether the stimulus is large (such as a very heavy object) or small (such as a very small stimulus), the just-noticeable difference is a percentage of the stimulus' overall magnitude and appears to be a relatively fixed proportion (such as 10%). (such as a very light object).

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