About the task
Implements n-pair concurrent auditory discrimination. The subject is presented with a series of pairs of stimuli; in each pair, one is correct (+) and one is wrong (-). One stimulus is played through the left speaker, the other is simultaneous played through the right.
Configuring the task
This task involves stereo auditory discrimination. Therefore, to run, both "Stereo system..." and "Subject is considered to have responded to a stimulus when it... approaches it" must be selected in the General Parameters.
| • | Maximum number of trials. When the subject has performed this number of trials, the task ends. (You may specify 0 for no limit, though you must specify a limit on the number of trials, the time, or both.) |
| • | Maximum time. When this time elapses, the task is terminated as soon as the current trial has finished. (You may specify 0 for no limit, though you must specify a limit on the number of trials, the time, or both.) |
| • | Finish when (X) of the last (Y) trials were performed correctly. I hope this is self-explanatory. |
| • | Response criterion time. If the subject fails make a response within this time, the subject fails the trial. (You may specify 0 for no limit.) |
| • | Time between trials. Specify a minimum and a maximum intertrial time (they may be the same). The actual time is chosen with a rectangular probability distribution within these values. |
| • | Keep playing correct stimulus during reward. If unticked, all stimuli vanish when one is chosen. If ticked, then if the incorrect stimulus is chosen both vanish; if the correct stimulus is chosen, the incorrect stimulus vanishes and the correct stays for a while (while reward is being delivered). |
| • | Pairs. This lists the pairs in use. Each pair will have one correct stimulus (+) and one incorrect stimulus (-). Click Add or Remove to add or remove pairs. Click Toggle to swap round which of the pair is correct. |
| • | Pair choice method. Which pair will be used on any given trial? You may either have the program choose a pair at random, or quasi-randomly (such that each of the pairs appears once in every n trials, where n is the number of pairs). |
When you click Add to add a pair, you see the following dialogue box (just as a reminder):
Then this dialogue box appears twice, once for each stimulus to be chosen:
Screenshots from the task
None; it's an auditory task! The screen is blank.