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

[Jaeyong Lee]

Dear Professional Faultfinder,

Thanks for posting your script!
In my experiment the response comes after the offset of the target
stimulus.
If it is not too much of a trouble, I would appreciate to hear about
your
solution to presenting other stimuli during the response period.

Thanks again!


On 9월3일, 오전4시08분, David McFarlane <mcfar... at msu.edu> wrote:
> Good timing -- It just so happens that I have been working on this
> very issue for a lab here.  You have to make the proper settings in
> your stimulus, and use a bit of inline code following the
> stimulus.  Here is the fully-commented inline code for my solution:
>
> '/----------------------------------------------------------------------
> ' We wish to present a stimulus (in this case, StimText), get a
> ' response during that stimlus, and raise a signal as soon as the
> ' subject responds.
> '
> ' To do that, we need to run this inline code during StimText.  We
> ' could simply set the Duration of StimText to 0 or so (depending on
> ' considerations such as leaving some time between stimulus .OnsetSignal
> ' and .OffsetSignal) and then our code would have to also handle
> ' further stimulus timing.  But with judicious use of Duration and
> ' PreRelease, E-Prime will automatically take care of stimulus timing
> ' for us.
> '
> ' So instead we simply set the Duration of StimText as desired (which
> ' as a result automatically determines the target onset time for the
> ' next stimulus object), and we set the PreRelease of StimText to a
> ' suitably large value (preferably >= Duration, but perhaps less due
> ' to other considerations as mentioned earlier).  Now this code will
> ' start to run soon after the onset of StimText, and handle the
> ' reaction to the subject response.
> '
> ' Finally, this code simply makes use of .IsPending() to detect the
> ' response (see the InputMask.IsPending topic in the online E-Basic
> ' Help).  Note that as a result StimText will last at least as long
> ' its input mask Time Limit, regardless of its Duration (if you just
> ' keep Time Limit at the default of "(same as duration)" then this
> ' will not pose a problem).
>
> Const  LptDataPort as Integer = &H0378  ' adjust this for your system
> Const  SignalData as Integer = &HFF  ' adjust this for your device
> Const  LoopDelay as Long = 2  'ms; set as small as possible for your
>          ' system
>
> Do While StimText.InputMasks.IsPending()
>          ' Some slower machines (such as my home laptop) need a delay so that
>          ' EP can detect & handle input:
>          Sleep LoopDelay
> Loop
> WritePort LptDataPort, SignalData
> '\----------------------------------------------------------------------
>
> This is fine as long as you limit the response to coming during the
> stimulus.  If you want to present a train of stimuli during the
> response period then you must do a little more.  I also have a
> solution for that, but it is rather intricate and too much trouble to
> go into here, so I hope this is good enough for now.
>
> -- David McFarlane, Professional Faultfinder
>
> At 9/1/2010 02:38 AM Wednesday, Jaeyong Lee wrote:
>
>
>
> >I was wondering if there is a way to send trigger signals locked on
> >the response time.
>
> >For instance,
>
> >Stim.OnsetSignalEnabled = True
> >Stim.OnsetSignalPort = &H378
> >Stim.OnsetSignalData = 1
>
> >WritePort &h378, 0
>
> >the above code send triggers at the onset of the object "Stim".
>
> >However, I am trying to figure out a way to send triggers at the time
> >of response of "Stim".
>
> >I would greatly appreciate all tips and advices from you.  Thanks.

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