Simultaneous asynchronous loops//procedures

[David McFarlane]

Dave,

Clearing my desk/computer and working through some old postings that 
have lingered in my mind...

Back when I programmed in C, I did dual-task designs like this by 
first building a complete "schedule" of all timed events, including 
randomization, jitter, etc.  Then I would just roll that out in an 
event loop that also took care of all I/O and unscheduled 
(contingent) events.  I can see how to do that in E-Prime too, 
although I have not yet had to build such a design.  I imagine it 
would involve some rather serious construction of Lists in script at 
the head of the program, and then just letting E-Prime unroll it 
all.  Might not be pretty, but could be done.

-- David McFarlane, Professional Faultfinder


At 4/28/2009 04:34 PM Tuesday, you wrote:

>I have a bit of a quandry I'm hoping someone has an idea for.
>I'm trying to figure out a way that I can have different looping
>procedures (e.g., lists) running "simultaneously", but the key is that
>the actual stimulus presentations are asynchronous.
>
>As a matter of explanation, I have a background tone that is played
>constantly - lets say exactly every 450 ms
>Meanwhile, there is is a task occuring on top of that - lets say, 1
>trial every 5-7 seconds, but not consistantly (inter-trail jitter).
>Also (and this is the key), the occurance of tasks procedures do not
>line up w/ the background tones - sometimes they will overlap,
>sometimes not (lets say the task presentations last 1000 ms).
>Task and background must be asynchronous like this, so that event-
>related EEG to one (e.g. background) will average out to noise when
>averaging for the other (e.g. task).
>
>Any way to do this? Inline scripting is no problem if necessary.
>The difficulty is that I need to get data triggers for al lstim onsets
>(e.g. OnsetData etc), otherwise I owuld simply pre-record the
>background tones as one long .wav file and play it to stream with with
>duration = 1 while teh rest of the experiment runs... but that gives
>only the onset of the main file.
>
>I assume there is no way to trigger one List/Procedure to bigin, but
>move on to the next before it completes?
>
>thanks,
>
>Dave


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