#limen__threshold  the smallest detectable sensation
  supertype:  sense_experience__senseexperience__sensation__sense_impression__senseimpression__sense_datum__sensedatum  an unelaborated elementary awareness of stimulation; "a sensation of touch"
  subtype:  absolute_threshold  the lowest level of stimulation that a person can detect
     subtype:  pain_threshold  the lowest intensity of stimulation at which pain is experienced; "some people have much higher pain thresholds than do other people"
  subtype:  difference_threshold__differential_threshold__difference_limen__differential_limen  the smallest change in stimulation that a person can detect
     subtype:  just-noticeable_difference__jnd  (psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected

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