Resetting the clock upon trigger onset.

[David McFarlane]

Eric,

You should ask PST Support about this (see link below).  AFAIK 
E-Prime does not allow for resetting the global session clock, nor 
should it.  (In fact, the PsychoPy folks have had this discussion 
with regards to their ioHub facility, with the same 
conclusion.)  Allowing for such an activity would open the way to too 
much abuse & mistakes.

When I have wanted to have times reported relative to some global 
starting time (e.g., quality check of fMRI designs), I have just 
added some inline code to compute & log the adjusted values at 
runtime.  In fact, once I have gone that far, it's not too much more 
trouble to add a final global quality check, along with raising an 
alarm to notify users at the end of a session about things they 
should look at in the .edat file.  With a little bit of effort you 
can have E-Prime take care of all sorts of details for you.

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

/----
Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
take any and all questions at https://support.pstnet.com , and they 
strive to respond to all requests in 24-48 hours, so make full use of 
it.  3) In addition, PST offers several instructional videos on their 
YouTube channel (http://www.youtube.com/user/PSTNET ).  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.
\----


At 1/29/2014 05:44 PM Wednesday, Eric Dixon wrote:
>Currently, e prime starts timing the experiment after I press the 
>run button. This means that there can be several seconds (variable) 
>between clicking the run button, entering in participant ID, session 
>ID and the start of the actual experiment. I would like to either 
>start or reset the clock so that the timing starts at the beginning 
>of the experiment and not before.
>
>As of now we have to subtract the time between clicking run and the 
>beginning of the stimulus from each stimulus onset inorder to find / 
>quality check there actual onsets for processing. Obviously this can 
>be tedious and if I can simplify the data processing stream it could 
>save tons of time.
>
>In short, is there a way to either reset or start timing at the 
>onset of the experiment.
>
>Please let me know if you have any questions.
>
>
>thanks,
>Eric

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