Slide state objects and triggering

[Paul Gr]

Don,

One thing you can do is to move your OnsetSignalEnabled initialization code
to an inline script which is placed just before the slide you mention.
Inside this script you can configure the trigger code according to the
current state:

Select Case Slide1.ActiveState
   Case "State1"
      Slide1.OnsetSignalEnabled = true
      Slide1.OnsetSignalPort = &H378
      Slide1.OnsetSignalData = 12

   Case "State2"
      Slide1.OnsetSignalEnabled = false
End Select

Another possibility is to add another attribute to your triallist
('TriggerCode') to hold the numeric trigger value, and then use this
attribute to set the OnsetSignal properties. A value of zero would disable
the trigger in this example:

Dim someCode as Integer
someCode = CInt(c.GetAttrib("TriggerCode"))
if someCode<>0 then
      Slide1.OnsetSignalEnabled = true
      Slide1.OnsetSignalPort = &H378
      Slide1.OnsetSignalData = someCode
else
      Slide1.OnsetSignalEnabled = false
end if

I would prefer to use the latter option because it works with all
RteRunnableInputObject objects, not only with slides. Also, this way the
trigger codes is more explicitly available in you triallist and data output.

best,
paul groot


>From: <Don.Rojas at UCHSC.edu>
>To: <eprime at mail.talkbank.org>
>Subject: Slide state objects and triggering
>Date: Wed, 2 Mar 2005 14:27:04 -0700
>
>Does anyone know whether it is possible to set up parallel port
>triggering for individual slide state objects, rather than for the
>entire slide object, via the OnsetSignalEnabled method?  I'm using a
>Slide object with two states to present a visual stimulus and then a
>masker controlled by two levels of a triallist object (stimulus and
>masker), by changing slide states during a single "trial" (i.e., one
>cycle of the triallist object).  Setting the OnsetSignalEnabled method
>up for the whole slide object produces two identical sets of trigger
>onsets and offsets per trial, which can get confusing on the data
>analysis end.  It would be nice if I could get only 1 of the slide
>states to produce a trigger.
>
>
>
>Donald C. Rojas, Ph.D.
>
>Associate Professor of Psychiatry
>
>University of Colorado Health Sciences Center
>
>Campus Box C268-68
>
>4200 E. 9th Avenue CPH Rm 2J08
>
>Denver, CO 80220
>
>(303) 315-8624
>
>
>

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