Limen

Threshold of perception or response

For other uses, see Limen (disambiguation).

In physiology, psychology, or psychophysics, a limen or a liminal point is a sensory threshold of a physiological or psychological response. Such points delineate boundaries of perception; that is, a limen defines a sensory threshold beyond which a particular stimulus becomes perceivable, and below which it remains unperceivable.[1]

Liminal, as an adjective, means situated at a sensory threshold, hence barely perceptible. Subliminal means below perception. The absolute threshold is the lowest amount of sensation detectable by a sense organ.

## See also

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* Just noticeable difference (least perceptible difference)
* Threshold of pain, the boundary where perception becomes pain
* Weber–Fechner law (Weber's law)

## References

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1. ^ Holden, Jameson K.; Francisco, Eric M.; Zhang, Zheng; Baric, Cristina; Tommerdahl, Mark (2011). "An Undergraduate Laboratory Exercise to Study Weber's Law". Journal of Undergraduate Neuroscience Education. 9 (2): 71–74. PMC 3592720. PMID 23493843.

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