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

[Kelsey A Brown]

Dear David McFarlane, 

I also want to thank you for taking the time to answer my question and for 
providing links to similar discussions. I like the idea of using the 
counterbalance by subject option. I will certainly implement both your 
suggestion and David V's instructions when I return to building my task 
tomorrow. 

Thank you, 
Kelsey 

On Tuesday, September 9, 2014 10:18:50 AM UTC-4, McFarlane, David wrote:
>
> Kelsey, 
>
> What David V said, except that I would use Counterbalance by Subject 
> selection instead of Offset by Subject.  Counterbalance does pretty 
> much the same as Offset plus Reset/Exit After 1 Sample, but may be a 
> bit more convenient.  Please see discussions at 
> https://groups.google.com/d/topic/e-prime/JtLh6DxqCbs and 
> https://groups.google.com/d/topic/e-prime/CHntiIUbUmc . 
>
>
> ----- 
> David McFarlane 
> E-Prime training 
> online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx 
> Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster) 
>
> /---- 
> Stock reminder:  1) I do not work for PST.  2) You may reach PST's 
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> \---- 
>
>
> At 9/9/2014 05:19 AM Tuesday, Vinson, David wrote: 
> >Dear Kelsey, 
> > 
> >There's a really easy way to set this up using E-Prime: using Offset 
> >by Subject selection to determine at the start of a run which 
> >condition a Subject is in, selecting it from a higher level List. 
> > 
> >Create a List with two rows, one with procedure HighFrustProc and 
> >the other LowFrustProc, weight = 1. This List can have the attribute 
> >pctcorrect (.80 for low frustration, .30 for high 
> >frustration).   Then set Selection properties of this List to Order: 
> >Offset, Order by: Subject.   And Reset/Exit to Exit List: After 1 Sample. 
> > 
> >This way odd numbered subjects would run the HighFrust (or whatever 
> >is in the first line of the List) and even numbered, the LowFrust. 
> > 
> >Then each of these two Procedures would contain the other various 
> >elements of your experiment (e.g. the item Lists and trial 
> >Procedures), using the same objects and sub-procedures wherever 
> >possible to ensure that the two conditions are otherwise the same. 
> > 
> >If you don't like the strict alternation of odd/even Subject 
> >numbers, could take the same kind of approach by creating a random 
> >sequence in advance and using this to populate this List object (ie, 
> >80 rows, again offset by subject number).  Not elegant but very easy 
> >and transparent to implement. 
> > 
> >best, 
> >DavidV 
> > 
> > 
> >________________________________________ 
> >From: e-p... at googlegroups.com <javascript:> [e-p... at googlegroups.com 
> <javascript:>] on behalf 
> >of Kelsey A Brown [kbr... at wellesley.edu <javascript:>] 
> >Sent: 08 September 2014 22:27 
> >To: e-p... at googlegroups.com <javascript:> 
> >Subject: setting two different conditions for the experiment as a 
> >part of the initial script 
> > 
> >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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