Of the stimulus will be displayed on the y axis. Your data will be presented on this tab where the trials will be on the x axis and the intensity value When the experiment has been completed, you will be instructed that you can view your results. If you have and No (or press the '/' key) if you have Click or press Yes (or press the 'z' key) A dot will be presented above this mark.Īfter it has been presented, buttons will appear asking if you have seen the dot. Keep your eyes fixated on the red plus sign in the middle of the screen. On the Experiment tab, press the space bar or the Start button on the screen to start the experiment. Pressing this button restores the stimulus settings to their default values. Reset: at the top of the settings page is a Reset button. Maximum Value of Relative Dot Luminance: what is the most intense dot to be displayed. Minimum Value of Relative Dot Luminance: what is the least intense dot to be displayed. Number of Staircases: how many staircases (series) will be presented (always an even number). Number of Levels of Relative Dot Luminance: how many steps there are in the staircase (series). On this tab, you can adjust how the method will work. Pressing this button restores the method settings to their default values. The dot values are differences from this level. The settings include the following:ĭot Diameter: the diameter of the dot in pixels.ĭot Position: the distance the dot is above the fixation mark (in number of diameters of fixation mark).īackground Level: brightness of the background against which the dot is to be detected (in the basic intensity values of the screen). See how this might affect your ability to detect the dot. On this tab, you can adjust the various parameters To see the illustration in full screen, which is recommended, press the Full Screen button, which appears at the top of the page. Instructions If you do not see six (6) tabs across the top, widen your browser or rotate your phone or tablet so that it is wide. Your threshold is the average of these crossover points. These two types of staircases, descending and ascending, will continue until you have completed all that theĮxperiment requires. You have crossed from nondetection over to detection. This response is also a crossover response as This series willĬontinue until you respond that you did detect the stimulus. Then the next more intense stimulus in the series will be presented. You should not be able to detect in and respond Then a descending staircase will begin with the least intense stimulus. ![]() ![]() This response is called a crossover point as you have crossed from detection This series will be continued until you respond with a no Then the next most intense stimulus will be presented. If you detect that stimulus, you will again respond The next stimulus to be presented will be the next most intense. Since the most intense stimulus is readily detectable, you should have no trouble responding with a yes you detected it. In this experiment, we will start with a descending staircase. ![]() These values are then presented in order, going from the most intense to the least intense, a descending staircase, andįrom least intense to most intense, an ascending staircase. The researcher hopes to pick a value that is readily detected and a value that is never detected and then several values between. In the method of limits, stimuli are presented in a graduated scale, and participants must judge whether they detected
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