sending trigger to other devices locked on to the time of response

[Tobias]

David,

I had the following idea to resolve the problem: I will set duration of the 
slide called "search" to 200 ms with "terminate" as end action. I will then 
present the same slide for the residual time (i.e. 200 ms - RT).

I used the following inline script:

WritePort &HD030, 0
search.OnsetSignalData = "100"    'Sends marker for search display
search.OffsetSignalData = 0
Search.Run

if Search.OffsetTime - Search.OnsetTime < 1998 then  'I usually set the 
last digit to an 8 since that rounds up to 10 which is the shortest refresh 
cycle we can do here
    Search.Duration = 1998 - (Int((Search.OffsetTime - 
Search.OnsetTime)/10+0.8)*10)  ' this rounds up for all digits except 0 or 1
    search.OnsetSignalData = 0
    search.run   'this runs search again, but with reduced duration this 
time  
end if

WritePort &HD030, 0
Response.OnsetSignalData = "200"    'Sends marker for response
Response.OffsetSignalData = 0

if search.RESP <> "" then goto Label1

Response.run


There are several problems with this approach that I don't fully understand:

- Search.OffsetTime - Search.OnsetTime turns out to be not the actual 
duration but the duration minus the pre-release time
- When resetting the duration time, I found out (trial and error) that I 
should have 1948 - .... instead of 1998 - ...
- in 80% of the cases, the interval between the triggers is exactly 2000 ms 
(according to the eeg file that is). In 20% of the cases it is 10 ms too 
short.

What do you think of this approach and do you know why the mentioned 
problems occur?

Best,
Tobias

Am Donnerstag, 24. Mai 2012 18:04:56 UTC+2 schrieb McFarlane, David:
>
> Tobias, 
>
> I cannot go into detail here, but in broad scope, we achieved this by 
> using inline code much like the example posted earlier in this 
> thread, but using it after each of the stimulus objects that might 
> receive a response.  We of course also used extended input through 
> the entire response period.  We also had to add a "flag" variable to 
> carry some information between the InLines.  This approach does get 
> rather tedious and intricate.  (I do point out, however, that at 
> least EP provides all the elements for any reasonably skilled 
> programmer to achieve the desired effect, which I would not say for 
> all psychology programming platforms.) 
>
> The new Task Events feature introduced in EP2.0.10.182 may give us a 
> better way to do this, but that also has limitations, see 
>
> http://groups.google.com/group/e-prime/browse_thread/thread/f6fa4b793264fa5c. 
>
> -- David McFarlane 
>
>
> At 5/24/2012 10:54 AM Thursday, you wrote: 
> >Hi David, 
> > 
> >thanks for your solution. You might have seen my other recent 
> >posting 
> >(https://groups.google.com/forum/?fromgroups#!topic/e-prime/GkQSKYep2so) 
> >where I have the following paradigm: 
> > 
> >1) 200 ms search slide (fixed duration) 
> >2) up to 5000 ms response slide (terminated by response to 1)) 
> > 
> >I managed to have a fixed duration for 1) and a terminating 
> >presentation for 2) but I don't seem to being able to manage that a 
> >trigger will be sent during 1) 
> > 
> >Any ideas how to implement your solution to my example? 
> > 
> >Best, 
> >Tobias 
>
>

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