OnsetTime Options in Task Events

[David McFarlane]

Jens,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
take any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours -- this is pretty 
much their substitute for proper documentation, so make full use of 
it.  3) In addition, PST takes questions at their Facebook page 
(http://www.facebook.com/pages/Psychology-Software-Tools-Inc/241802160683 
), and offers several instructional videos there and on their YouTube 
channel (http://www.youtube.com/user/PSTNET ) (no Twitter feed yet, 
though).  4) If you do get an answer from PST staff, please extend 
the courtesy of posting their reply back here for the sake of others.

That said, here is my take...

I take it your question is merely about the difference between 
"TargetOnsetTime" and "OnsetTime", without regard to the new Task 
Event feature (which I have not yet explored in detail).  In that 
case, you may start with my essay at 
http://groups.google.com/group/e-prime/browse_thread/thread/39e899d3457d4917 
.  From that you should conclude that TargetOnsetTime is merely an 
internal bookkeeping value that indicates only when stimulus 
presentation is scheduled to start, regardless of when presentation 
does start.  OnsetTime indicates when presentation does start, so 
offhand I would think that you want triggers to happen relative to 
OnsetTime.  An OnsetDelay of 5 ms means that a stimulus presentation 
started 5 ms after its scheduled time (i.e., its 
TargetOnsetTime).  If you add a delay of 5 ms from OnsetTime, then 
your triggers should occur at, well, 5 ms after the actual start of 
stimulus presentations.

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


At 4/24/2012 09:37 AM Tuesday, you wrote:
>Hi
>
>I'm using EP 2.0.10.182 *Professional* with the Task Event feature and
>am wondering about the delay option.
>I am triggering a text object using the WriteByte action from a custom
>source drawn from an attribute in a list. Do you guys think it is a
>valid option to use the delay function and hold the trigger for the
>mean value of the onset delay received from a previous test run?
>
>When I run the experiment I get a mean OnsetDelay value of ~5ms for
>that text object. I assume that the trigger is not adjusted and sent
>on the actual onset time of the text object, but delivered on the
>target onset time. Right?
>
>So, what's your take on this?
>
>Best
>Jens

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