Limen

limen

/ˈlīmən/

A limen is a threshold, specifically the sensory boundary in psychology or physiology at which a stimulus becomes barely perceptible or triggers a response (e.g., the absolute threshold of hearing). It represents the limit below which a stimulus is unnoticed ("subliminal") and above which it is consciously perceived. —Merriam-Webster

Usage Examples:

Psychophysics:

"The study measured the auditory limen, determining the quietest sound the subject could hear".

Metaphorical:

"The sound remained just below the limen of her conscious awareness".

Anatomy:

"The limen insulae represents a boundary point in the brain". —Merriam-Webster

Synonyms:

Threshold, Borderline, Boundary, Entrance/Portal (rare) —Merriam-Webster

Key Details:

• Plural: Limina
• Etymology: Latin for "threshold".
• Key Concept: Used in "Just Noticeable Difference" (JND) scenarios.

—Reddit