UPPER THRESHOLD By N., Pam M.S. - April 29, 2013 1. fora difference threshold, the limit at which the stimulant is considered to be more significant than the principle. 2. the greatest severity of a stimulant which can be interpreted in the absence of pain. UPPER THRESHOLD: "The upper threshold has yet to be identified." Related Psychology Terms WEBER FRACTION AUDITORY THRESHOLD I SUPRALIMINAL WEBER-FECHNER LAW TWO-POINT THRESHOLD THRESHOLD ALL-OR-NONE LAW AUDITORY SENSATION UNIT GALTON BAR WEBER'S LAW Cite this page: N., Pam M.S., "UPPER THRESHOLD," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/upper-threshold/ (accessed May 25, 2020).