Setting triggers at specific time points after stimulus onset

[David McFarlane]

A couple thoughts to move you forward:

1) Set the Duration of your sound stimulus object to 500, then follow 
that by any other object (e.g., Wait) with a Duration of 
(sound_stimulus_duration - 500).  Remember, if you set Stop After of 
the sound stimulus object to No then the sound will continue to play 
even after the end of the sound object.

2) Set the Duration of your sound stimulus object as normal, and set 
its PreRelease to (Duration - 500) (you will have to do that manually 
because you cannot enter calculations there, otherwise do 
calculations in InLine and use an attrbute reference for 
PreRelease).  Set Stop After as appropriate.  I prefer this approach 
myself as it makes the time managment cleaner, but this scares people 
who do not understand PreRelease.

Also look at the threads at 
http://groups.google.com/group/e-prime/browse_thread/thread/cfc3d0307d5c7fbd 
and 
http://groups.google.com/group/e-prime/browse_thread/thread/ef0e5a8d8b87aa0c 
for some somewhat related topics.

-----
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 11/7/2012 11:30 PM Wednesday, Taewon Chung wrote:
>I'm running an ERP experiment using e-prime and brainvision amp
>
>I would like to set triggers for a sound stimulus (four-syllable 
>words) at a certain duration after stimulus onset (i.e. trigger 
>after every 500 ms post stimulus onset). of course, the actual 
>presentation time of the stimulus is longer than 500 ms.
>
>Is there any script or in-line for such things? Is there any way to 
>set triggers at specific time points after stimulus onset?
>
>Also, is there a way to have triggers appear at specific time points 
>by typing in certain duration for ech stimulus in the "attribute"?
>
>Thanks :)

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