stimulus threshold; stimulus limen
Technical term in psychology and physiology; the minimum intensity of a stimulus needed to produce a sensation or response.
See also: 閾 (いき)
Light below the stimulus threshold is invisible to the human eye.
In this experiment, we measure the stimulus threshold for sound.
Compound of 刺激 (stimulus) and 閾 (threshold). The reading いき for 閾 is a standard on'yomi.