Answer :
When you notice the soft sound of rain on the roof, it has crossed a perceptual line called your Aboslute.
The soft sound of rain on the roof has crossed a perceptual line known as your absolute threshold for detecting an auditory signal.
What is absolute threshold?
The lowest magnitude at which a sensory stimulus will consistently elicit a sensation is referred to as absolute threshold.
Example, noticing the soft song of the rain on roof, to determine the smallest amount of perfume that a subject can detect in a large room.
Thus, the answer is absolute threshold.
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