The term "Threshold Value" refers to the minimum level or point at which a certain effect or response begins to occur. In various fields, such as psychology, biology, and economics, it helps determine when a stimulus becomes noticeable or when a change in behavior is triggered. For example, in psychology, it can indicate the smallest amount of a stimulus needed for a person to perceive it. In environmental science, the threshold value can signify the level of pollutants in the air or water that, when exceeded, can lead to harmful effects on health or ecosystems. Understanding these values is crucial for setting regulations and ensuring safety in various contexts.