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

[Kelsey A Brown]

Dear David V, 

Thank you for the incredibly detailed and easy to understand instructions. 
I figured it was something that could be accomplished in E-prime, but I was 
unsure of the exact steps to follow to make it happen. I appreciate the 
invaluable assistance!

Best, 
Kelsey  

On Tuesday, September 9, 2014 5:19:49 AM UTC-4, Vinson, David: UCL 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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