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Post by Clodagh on May 20, 2020 15:47:15 GMT
Hello,
I recently used the stop signal task as formatted on this website for my study. I am wondering if there is a way to automatically get a file containing the SSRT for each participant when downloading the data? Alternatively, is there a way of calculating the SSRT from the data already in the output by myself?
Thanks,
Clodagh.
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Post by PsyToolkit on May 20, 2020 17:46:08 GMT
I am not sure I fully understand exactly what you would like to do. Can you maybe explain it a bit more?
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Post by Clodagh on May 21, 2020 9:30:30 GMT
Firstly thank you for your quick reply, it is much appreciated!
As part of my study, I would like to obtain a measure of each participants'response inhibition ability. I was hoping to use the stop-signal reaction time (SSRT) as a measure of this. I know typically when a tracking procedure or staircase procedure is used in the task (i.e on the no-go trials the stop-signal appears 50 seconds later if the person correctly inhibits themselves on the previous no-go trial or appears 50 seconds earlier if they did not correctly inhibit themselves) that you usually calculate the SSRT by subtracting the mean stop-signal delay (SSD) from the mean RT for each participant. It was unclear to me though whether the stop-signal task on this website utilises the tracking procedure, so I am unsure whether I would be able to use this method to calculate the SSRT from the output in the txt files myself. So I would firstly like to know if this is possible to calculate the SSRT with this method when using the stop-signal task from this website?
If it is possible to calculate the SSRT from the output of this task, is there a way of generating the SSRT automatically on the website for example by using the analyse section of the experiment's page or with another method?
If it is not possible to use SSRT as a measure of inhibition with the stop-signal task on this website, is there a measure of inhibition that you would suggest I should use instead with this stop-signal task?
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Post by Nashla on Aug 24, 2020 20:31:13 GMT
I have the EXACT same question as Clodagh, but it doesn't seem to have been answered from May 21st, so I will second this question. Our lab would also like to calculate SSRT, which is the classic calculation for the variable of inhibition. However, it does not seem to possible to calculate if the version on PsyToolkit does not use the ladder method--as Clodagh says, the classic Logan measure adjusts each trial +/- 50ms based on a correct/incorrect response. It is not clear whether your version does this (I would assume not). I am also curious if data using this simplified version would even be valid to present for publication, given that there are only 40 trials and the original version includes 128 trials. If 50% of the stop signal trials are supposed to be used in the calculation for delayed response time subtraction, that would mean only using 5 trials (as there are only 10 no-go trials in this version). Clarification as to how this data should be used/ analyzed would be very helpful. Thank you!
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