![]() "Abor t" indicates that the method should stop as soon the ![]() Theparameter will never be larger than the specified maximum The experiment) "Clamp" indicates that the value taken by Method depends on the selected mode: "None" indicates it hasĮffect and the parameter may take any value (note that a warningĮrror message may be displayed in the experiment log window O Maximum value specifies the highest value the parameter is Parameters can be specified using either numbers, variables, The starting intervalĬorrespond to a suprathreshold level. O Initial value (mean range)value for the parameter will be Stimulus event so the method properly controls the level of the The same name must be used when customizing the Name does not appear in the pop-up menu, enter it in the Variesacross the trials (dependent variable of the experiment O Parameteris is the name of the stimulus property whose level Properties for the staircase method are divided in 2 Recommendations on the design ofefficient and reliable Properties panel (seeKaernbach1991,Brown 1996,Garcia-Prez 1998for The number ofconsecutive responses can be customized in the The increase and decrease rates, the number of reversals, and Thethreshold is then estimated byĪveraging the values of the stimulus levels obtainedfor the last Thisprocess is repeated until a given number Reversaloccurs when the stimulus level has been lowered and then ![]() Raised after a number of consecutive incorrect responses. Lowered after a given number of consecutive correctresponses and Higher or lower stimulus level basedon a simple rule: the level is The session starts with trials at suprathreshold levels, then,ĭepending on thesubject's responses, the next trials use either a The psychometric threshold (Dixon & Mood1948). Threshold, because the levelsamples are adaptively clustered around The staircase method is more efficient for estimating the ![]()
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