Millisecond Forums

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SanWin - 5/22/2025

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?

You need to look at the scripts you used to collect the respective data. By reading the code, you can determine exactly how SSRT is calculated.

I know, that the mean method is used, It is based on older SST task. The Stop Signal Task, a measure of response inhibition as described in Verbruggen et al (2008).
I really can`t find how the exact calculation is in the inquisit script I have.  That`s why I`m asking. 

First, it's explained in the script and it's obvious from the code. Second, it's also explained in Verbruggen et al. 2008.

The wrinkle here is that ns_rt is not what is used to calculate SSRT. ns_rt is the mean reaction time in correct no-signal trials (across all test blocks), also referred to as 'choice reaction time'.
But SSRT is determined by calculatig mean raw RT first (i.e., the mean RT for all no-signal trials, hits as well as misses), and then mean SSD is subtracted from this value (cf. Verbruggen et al. 2008, page 482).

I read all given literature and the script. In my script I Had to use there is no explanation how (raw) data is processed and for me it is not obvious from the code. Can you tell me in which part of the script this should be? The only thing I know from the literature given is the mean method. But not how raw data is used or should be treated. 

Oh, sorry, my fault, I meant the mean reaction time in ss trials not ns_rt. I`ll try it again in case of errors I made.

But just calculating the mean of all SSRTs of all trials of raw data doesn`t make sense? Or all SSRTs in sstrials? And why is there a SSRT value in every trial and every line of the raw data output. 
Thank you so far

> In my script I Had to use there is no explanation how (raw) data is processed and for me it is not obvious from the code. Can you tell me in which part of the script this should be?

Look at the values and expressions sections.

> But just calculating the mean of all SSRTs of all trials of raw data doesn`t make sense? Or all SSRTs in sstrials?

No, that does not make sense.

> And why is there a SSRT value in every trial and every line of the raw data output.

You can read that as "this is the SSRT estimate based on the data available up to and including the current trial (line)."

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?

You need to look at the scripts you used to collect the respective data. By reading the code, you can determine exactly how SSRT is calculated.

I know, that the mean method is used, It is based on older SST task. The Stop Signal Task, a measure of response inhibition as described in Verbruggen et al (2008).
I really can`t find how the exact calculation is in the inquisit script I have.  That`s why I`m asking. 

First, it's explained in the script and it's obvious from the code. Second, it's also explained in Verbruggen et al. 2008.

The wrinkle here is that ns_rt is not what is used to calculate SSRT. ns_rt is the mean reaction time in correct no-signal trials (across all test blocks), also referred to as 'choice reaction time'.
But SSRT is determined by calculatig mean raw RT first (i.e., the mean RT for all no-signal trials, hits as well as misses), and then mean SSD is subtracted from this value (cf. Verbruggen et al. 2008, page 482).

I read all given literature and the script. In my script I Had to use there is no explanation how (raw) data is processed and for me it is not obvious from the code. Can you tell me in which part of the script this should be? The only thing I know from the literature given is the mean method. But not how raw data is used or should be treated. 

Oh, sorry, my fault, I meant the mean reaction time in ss trials not ns_rt. I`ll try it again in case of errors I made.

But just calculating the mean of all SSRTs of all trials of raw data doesn`t make sense? Or all SSRTs in sstrials? And why is there a SSRT value in every trial and every line of the raw data output. 
Thank you so far

+x

 

SanWin - 5/22/2025

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?

You need to look at the scripts you used to collect the respective data. By reading the code, you can determine exactly how SSRT is calculated.

I know, that the mean method is used, It is based on older SST task. The Stop Signal Task, a measure of response inhibition as described in Verbruggen et al (2008).
I really can`t find how the exact calculation is in the inquisit script I have.  That`s why I`m asking. 

First, it's explained in the script and it's obvious from the code. Second, it's also explained in Verbruggen et al. 2008.

The wrinkle here is that ns_rt is not what is used to calculate SSRT. ns_rt is the mean reaction time in correct no-signal trials (across all test blocks), also referred to as 'choice reaction time'.
But SSRT is determined by calculatig mean raw RT first (i.e., the mean RT for all no-signal trials for which there was a response, whether correct or incorrect), and then mean SSD is subtracted from this value (cf. Verbruggen et al. 2008, page 482).

+x

 

Dave - 5/22/2025

+x

 

SanWin - 5/22/2025

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?

You need to look at the scripts you used to collect the respective data. By reading the code, you can determine exactly how SSRT is calculated.

I know, that the mean method is used, It is based on older SST task. The Stop Signal Task, a measure of response inhibition as described in Verbruggen et al (2008).
I really can`t find how the exact calculation is in the inquisit script I have.  That`s why I`m asking. 

+x

 

SanWin - 5/22/2025

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?

You need to look at the scripts you used to collect the respective data. By reading the code, you can determine exactly how SSRT is calculated.

Hello,
I have old data files for 2 groups.  One group has 3 blocks and the other one 2 blocks. For the group with 2 blocks I only have got the summary data for the group with 3 blocks I have summary and raw data. 
To compare them I wanted to calculate the SSRT over 2 blocks for the group with 3 blocks. But I have serius problems to do that, because I don`t know how.
I have SSRT values in every line (trial), also nstrials. The same with SSD and every other value.
To check if I calculate correct, I first tried to get the SSRT for all 3 blocks to compare with the summary value.
I tried to calculate: mean of all SSRT values in sstrials (except if it was the first trial)
and nsRt in all correct go trials minus mean SSD in all sstrials

But I don`t get the same values. 
Can anybody please help me with that?