setting two different conditions for the experiment as a part of the initial script

[Kelsey A Brown]

Hello Everyone, 

I just have a follow up question to my question above. I was able to create 
the list for the two groups with pctcorrect as an attribute following all 
of the steps David V and David McFarlane provided; however, I have a brief 
question about running the experiment with this setup. Will I be able to 
determine which trialproc a subject was placed in (highfrustrationproc or 
lowfrustrationproc) or is this something I would have to designate 
beforehand? I figure with the counterbalancing I wouldn't have to designate 
this, but I would need to know which procedure each participant completed. 
Also, in the experiment object properties startup information, I have group 
checked where I can input either 1 or 2 to state which condition the 
participant is assigned.Is this beginning group step necessary if I have 
E-prime counterbalance subjects into the two conditions using the list I 
created? I guess the main question I am asking is if I can simple uncheck 
group in the experiment object properties start-up information given that I 
have counterbalanced the list of procedures?  
Thanks, 
Kelsey 

On Monday, September 8, 2014 5:27:08 PM UTC-4, Kelsey A Brown wrote:
>
> Hello Everyone, 
>
> I am trying to use E-prime to build a stop signal frustration task, but I 
> have encountered a few complications in building the task. 
> At the moment, I am trying to create an initial script that would allow 
> E-prime to automatically run a participant in a condition (high frustration 
> or low frustration) depending on the participant number that I input before 
> running the experiment. 
> So for example, if I wanted to run 80 participants, half would be placed 
> in the high frustration condition and the other half would be placed in the 
> low frustration condition. 
>
> I have some ideas about how this could theoretically be carried out, but 
> I'm not sure if/how this can actually be implemented in the script. For 
> example, I would want the initial script to begin by telling the program to 
> pull 40 random numbers 1-80 (I would need to somehow make the same 40 
> numbers be pulled each time). The 40 numbers pulled would be placed in the 
> low frustration condition where pctcorrect (percent correct)=.80. 
> If else, (so if one of the other 40 numbers were pulled), place the 
> participant in a high frustration condition where  pctcorrect (percent 
> correct)=.30. 
>
> e.g. If I were running the program and I typed in my participant number as 
> 3 and 3 was one of the random numbers pulled between 1 and 80 then the 
> program would automatically run the stop signal task placing the 
> participant in the low frustration condition where pctcorrect=.80 (where 
> participants could accurately inhibit on 80% of stop signal trials). 
>
> However, if the participant ID number was 8 and 8 was not one of the 40 
> random numbers initially pulled between 1 and 80 then the program would 
> place the participant in the high frustration condition where 
> pctcorrect=.30. 
>
>
> Is this something that is possible in E-prime? 
>
> I hope this makes sense. Thanks in advance for your input! 
> -Kelsey 
>
>

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