<div dir="ltr">Dear David V, <div><br></div><div>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!<div><br></div><div>Best, </div><div>Kelsey <br><br>On Tuesday, September 9, 2014 5:19:49 AM UTC-4, Vinson, David: UCL wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Dear Kelsey,
<br>
<br>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.
<br>
<br>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.
<br>
<br>This way odd numbered subjects would run the HighFrust (or whatever is in the first line of the List) and even numbered, the LowFrust.
<br>
<br>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.
<br>
<br>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.
<br>
<br>best,
<br>DavidV
<br>
<br>
<br>______________________________<wbr>__________
<br>From: <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uM1FQl5Xh4EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">e-p...@googlegroups.com</a> [<a href="javascript:" target="_blank" gdf-obfuscated-mailto="uM1FQl5Xh4EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">e-p...@googlegroups.com</a>] on behalf of Kelsey A Brown [<a href="javascript:" target="_blank" gdf-obfuscated-mailto="uM1FQl5Xh4EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">kbr...@wellesley.edu</a>]
<br>Sent: 08 September 2014 22:27
<br>To: <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uM1FQl5Xh4EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">e-p...@googlegroups.com</a>
<br>Subject: setting two different conditions for the experiment as a part of the initial script
<br>
<br>Hello Everyone,
<br>
<br>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.
<br>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.
<br>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.
<br>
<br>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.
<br>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.
<br>
<br>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).
<br>
<br>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.
<br>
<br>
<br>Is this something that is possible in E-prime?
<br>
<br>I hope this makes sense. Thanks in advance for your input!
<br>-Kelsey
<br>
<br>
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