▁level ▁at ▁which ▁an ▁increase ▁in ▁a ▁detected ▁stim ulus ▁can ▁be ▁perce ived . ▁Terminal ▁threshold : ▁the ▁level ▁beyond ▁which ▁a ▁stim ulus ▁is ▁no ▁longer ▁detected . ▁Me as uring ▁and ▁Test ing ▁S ens ory ▁Th resh olds ▁ ▁Def ining ▁and ▁meas uring ▁sens ory ▁th resh olds ▁requires ▁setting ▁the ▁sens itivity ▁limit ▁such ▁that ▁the ▁per ception ▁observations ▁lead ▁to ▁the ▁absolute ▁threshold . ▁The ▁level ▁of ▁sens itivity ▁is ▁usually ▁assumed ▁to ▁be ▁constant ▁in ▁determ ining ▁the ▁threshold ▁limit . ▁There ▁are ▁three ▁common ▁methods ▁used ▁to ▁determine ▁sens ory ▁th resh olds : ▁ ▁Method ▁of ▁Lim its : ▁In ▁the ▁first ▁step , ▁the ▁subject ▁is ▁stim ulated ▁by ▁strong , ▁easily ▁detect able ▁stim uli ▁that ▁are ▁decre ased ▁step wise ▁( desc ending ▁sequence ) ▁until ▁he / she ▁cannot ▁detect ▁the ▁stim ulus . ▁Then ▁another ▁stim ulation ▁sequence ▁is ▁applied ▁called ▁asc ending ▁sequence . ▁In ▁this ▁sequence , ▁stim ulus ▁intensity ▁increases ▁from ▁sub th reshold ▁to ▁easily ▁detect able . ▁Both ▁sequences ▁are ▁repeated ▁several ▁times . ▁This ▁yields ▁several ▁moment ary ▁threshold ▁values . ▁In ▁the ▁following ▁step , ▁mean ▁values ▁are ▁calculated ▁for ▁asc ending ▁and ▁desc ending ▁sequences ▁separately . ▁The ▁mean ▁value ▁will ▁be ▁lower ▁for ▁desc ending ▁sequences . ▁In ▁case ▁of ▁audi ometry , ▁the ▁difference ▁of ▁the ▁means ▁in ▁case ▁of ▁asc ending ▁vs . ▁desc ending ▁sequences ▁has ▁a ▁di agnostic ▁importance . ▁In ▁the ▁final ▁step ,