▁average ▁of ▁the ▁previously ▁calculated ▁means ▁will ▁result ▁the ▁absolute ▁threshold . ▁ ▁Method ▁of ▁constant ▁stim uli : ▁Stim uli ▁of ▁varying ▁intens ities ▁are ▁presented ▁in ▁random ▁order ▁to ▁a ▁subject . ▁Int ens ities ▁involve ▁stim uli ▁which ▁are ▁surely ▁sub th reshold ▁and ▁stim uli ▁which ▁are ▁surely ▁sup ra - th reshold . ▁For ▁the ▁creation ▁of ▁the ▁series , ▁the ▁approximate ▁threshold ▁jud ged ▁by ▁a ▁simpler ▁method ▁( i . e .: ▁by ▁the ▁method ▁of ▁limits ). ▁The ▁random ▁sequences ▁are ▁presented ▁to ▁the ▁subject ▁several ▁times . ▁The ▁strength ▁of ▁the ▁stim ulus , ▁perce ived ▁in ▁more ▁than ▁half ▁of ▁the ▁present ations ▁will ▁be ▁taken ▁as ▁the ▁threshold . ▁ ▁Ada pt ive ▁method : ▁Stim ulation ▁starts ▁with ▁a ▁surely ▁sup ra - th reshold ▁stim ulus ; ▁then ▁further ▁stim uli ▁are ▁given ▁with ▁an ▁intensity ▁decre ased ▁in ▁previously - defined ▁steps . ▁The ▁series ▁is ▁stopped ▁when ▁the ▁stim ulus ▁strength ▁become ▁sub th reshold ▁( this ▁is ▁called ▁the ▁turn ▁phen omena ). ▁Then ▁the ▁step ▁is ▁hal ved ▁and ▁the ▁stim ulation ▁is ▁repeated , ▁but ▁now ▁with ▁increasing ▁intens ities , ▁until ▁the ▁subject ▁perce ives ▁the ▁sound ▁again . ▁This ▁process ▁is ▁repeated ▁several ▁times , ▁until ▁the ▁step ▁size ▁reaches ▁the ▁pres et ▁minimal ▁value . ▁With ▁this ▁method , ▁the ▁threshold ▁value ▁can ▁be ▁del ine ated ▁very ▁accur ately . ▁The ▁initial ▁size ▁of ▁the ▁step ▁can ▁be ▁selected ▁depending ▁on