Akademik

Liminal
In neurolgy, at the threshold of perception to a sensory stimulus. In other words, just barely perceptible to the senses. "Liminal" comes from the Latin noun "limen" meaning "threshold." It makes sense, then, that "liminal" applies to the idea of a sensory threshold. "Subliminal" is below that threshold at which an effect is produced.
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1. Pertaining to a threshold. 2. Pertaining to a stimulus just strong enough to excite a tissue, e.g., nerve or muscle. [L. limen (limin-), a threshold]

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lim·i·nal 'lim-ən-əl adj
1) of or relating to a sensory threshold <\liminal research>
2) situated at a sensory threshold: barely perceptible <observation of \liminal hues is beset with difficulties (Elsie Murray)>

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adj.
(in physiology) relating to the threshold of perception.

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lim·i·nal (limґĭ-nəl) [L. limen threshold] barely appreciable to the senses; pertaining to a threshold.

Medical dictionary. 2011.