Absolute threshold
the minimum stimulation needed to detect a particular stimulus 50 percent of the time
The absolute threshold is the smallest amount of stimulus needed for a person to detect a sensory input. In other words, it is the minimum amount of energy required for a person to perceive a stimulus. This concept applies to all of our senses, including vision, hearing, taste, touch, and smell.
For example, if we are talking about vision, the absolute threshold is the minimum amount of light needed for a person to see an object. If the light level is too low, the object will be invisible. Similarly, for hearing, the absolute threshold is the minimum amount of sound pressure needed for a person to hear a sound. If the sound pressure is too low, the sound will not be audible.
The absolute threshold varies depending on the individual and the type of stimulus in question. Factors that can influence the absolute threshold include age, sensory adaptation, attention, motivation, and background noise. It is important to note that the absolute threshold is not a fixed value, but rather a range, and can be affected by a variety of factors.
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