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I am trying to set up a two-tone frequency discrimination task to find the "just noticeable difference" for a set of participants. In this task a given stimulus would be dependent upon the frequency of the previous stimulus together with the participant's response - whether it was correct or incorrect as well as how many responses were correct within 5 trials. Could anyone give me ideas about how to set up these contingencies? Thanks!
Hm. I would conduct this experiment by creating a series of Skip events for each time a user gives their answer - whether it be incorrect or correct.
Let's say you first allowed the participant to hear the sound file sound_1. Let's say they then gave the proper response to the stimulus sound_1. We would then use the skip command to move to a trial to continue the experiment under the condition that the user had properly responded to sound_1.
Since DirectRT doesn't yet have the same variable manipulation power that MediaLab has, you may need to create a more complex matrix of skips to track exactly how many of the 5 trials the user answered correctly.
For more information on the skip feature, see the following link: [URL]http://www.empirisoft.com/directrt/help/directrt_skipping.htm[/URL]
To see information on a similar feature (jumping), see this link: [URL]http://www.empirisoft.com/directrt/help/directrt_jumping.htm[/URL]
Also make sure you check out the collection of samples that comes installed with the software. They may help give you more direction with the experiment you're trying to create.