Randomize Trial Duration

[David McFarlane]

Dilip,

Yes, possible.  Briefly...  You will have to decide which object in 
your Procedure will have a variable Duration.  Then use an attribute 
reference for its Duration, e.g., [MyDur].  Add a nested List to your 
trial List, with a column (attribute) for MyDur, and put your various 
durations there.  Set this nested List to run in Random order (or 
Random with Replacement, as appropriate).  To get started with nested 
Lists, first do the nested Lists tutorial in Appendix C of the User's 
Guide that came with E-Prime.

You could also use some inline code to achieve other randomizing 
effects, I will let others describe that approach, I prefer to use Lists.

Regards,
-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)

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At 5/26/2014 09:42 PM Monday, Dilip Kumar wrote:
>I was wondering whether it is possible to randomize trial duration?
>I want to add (+/-)1 or 2 second factor to the trial in order to 
>make it unpredictable as well as to avoid any disruptions and 
>capture the maximum active response from the fMRI scanner.
>
>Is it possible? If yes then kindly share your ideas.
>
>Best Regards,
>Dilip

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