In physiology, psychology, or psychophysics, a limen or a liminal point is a sensory threshold of a physiological or psychological response. It is the boundary of perception. On one side of a limen (or threshold) a stimulus is perceivable, on the other side it is not.[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.

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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.