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

[David McFarlane]

Tobias,

Can't go into much detail, but I do not like this approach.  Your 
resetting of Duration between presentations of your Slide seems 
altogether too empirical & ad hoc (not to mention that you use "magic 
numbers" throughout your code).  Also, this approach will reset the 
input mask for each presentation of the Slide, so that the logged 
.RT, etc. will be only for the *final* presentation of the 
Slide.  And, if the subject responds in the interval between Slides, 
then you will miss the response (yes it does happen, I speak from 
experience).  But maybe I'm missing something.

OK, I'm off on break for a week or so, so will not be able to write 
back for awhile...  Good luck on the rest of this.

-- David McFarlane


At 5/25/2012 07:07 AM Friday, you wrote:
>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>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#%21topic/e-prime/GkQS 
> KYep2so>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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