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Stop Signal task or Go/No go task ?

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  • Hisham
    replied
    Hello Shreya, it would be best if I take a look at your experiment. I’ll contact you via email.

    Leave a comment:


  • Shreya
    replied
    No. of trials

    Hello.
    @Arman
    I tried to replicate the experiment you have shared here.
    However, I am following the parameters suggested by Verbruggen et al (2008), where there are 3 blocks of 64 trials each.

    Following the experiment you have posted, it is not presenting more than 32 trials. Could you suggest something to counter this?

    Leave a comment:


  • Arman
    replied
    I have attached an adaptive stop signal experiment that replicates the referenced study. It will be helpful to first read over the parameter and trial level notes.

    Please note that SuperLab has built-in Go/No-Go support. However, this experiment uses more of a conditional Go/No-Go, e.g. a trial becomes a "No-Go" only if a stop signal is presented. Therefore, we implement Go/No-Go using rules at the trial level.

    To implement the staircase procedure, we must keep track of whether or not the participant responded. We use a text parameter to store one of only two values. When the participant provides a response, the parameter is set to yes; otherwise, it will be set to no by default:



    At the end of the trial, check if the stop signal was presented and if the participant responded. If so, then this should be considered a failed inhibition, which will decrease the difficulty of the next stop task. If the stop signal was presented and the participant did not respond, i.e. a successful inhibition, increase the difficulty of the next stop task.

    Difficulty is determined by changing the delay between the go and stop signals. To implement this, a time trial level will be created and moved back and forth as a Rules action:





    To answer your second question, SuperLab does not calculate stop signal reaction time (SSRT) for you. To do so, look through your data files and average out the most recent stop signal delays. Also, find the median reaction time for trials that did not present a stop signal. Then, subtract average stop signal delays from median reaction time. This will be your SSRT value.
    Attached Files

    Leave a comment:


  • RTASG
    started a topic Stop Signal task or Go/No go task ?

    Stop Signal task or Go/No go task ?

    Is there any ready-made Stop signal or Go no go task made for Superlab ?
    It seems it would be quite difficult to develop it since it has a staircase procedure to increase or decrease the difficulty of the stimulus, depending on the reaction time of the participant.
    Furthermore, how would one get the various behavioral measures (SSRT) through Superlab, which are usually calculated in other software like CANTAB ?

    The task we want to replicate is the one described in
    Cortical and Subcortical Contributions to Stop Signal Response Inhibition: Role of the Subthalamic Nucleus (2006)
    Adam R. Aron and Russell A. Poldrack
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