In neuroscience and psychophysics, an<unk>  was originally defined as the lowest level of a stimulus – light, sound, touch, etc. – that an organism could detect. Under the influence of signal detection theory,<unk>  has been redefined as the level at which a stimulus will be detected a specified percentage (often 50%) of the time. The<unk>  can be influenced by several different factors, such as the subject's motivations and expectations, cognitive processes, and whether the subject is adapted to the stimulus. The<unk>  can be compared to the difference<unk> , which is the measure of how different two stimuli must be for the subject to notice that they are not the same.
Absolute threshold
Indicative limit value
Threshold limit value
Relative value unit
Minimal important difference
Multiple of the median
Risk difference
Independent SAGE