subliminal priming

[ben robinson]

maybe you you'd want to sleep for 10 ms before sending the "WritePort &H378,
0"... just a suggestion, won't necessarily fix it.
ben

On Tue, Aug 18, 2009 at 9:42 AM, vinz <godotworkaround at googlemail.com>wrote:

>
> Hello group,
>
> I am current running a subliminal ERP study. Everything is fine as far
> as the implementation of subliminal stimuli is concerned but we are
> experiencing problems with the triggers from E-Prime to the Neuroscan
> station.
>
> Specifically, we have noticed that any time E-Prime sends a trigger
> relative to a slide presented for a time between 100ms and 20ms (we
> don't have anything in between this two values, so I cannot be more
> specific) the trigger is sent twice, also affecting the following
> slide (presented for about 500ms).
>
> For the sake of clearness, the event table in Neuroscan looks like
> this:
>
> 1 3 3 7 7 1 |1| 3 |3| 3 7 7 3 3 1
>
> instead of:
>
> 1 3 3 7 7 1 3 3 7 7 1 3 3 7 7 1
>
> where '1' is the trigger code for the subliminal stimulus, and |1|,|3|
> are actually doubled. In fact the latencies for the first 1 and the
> second |1| are equal. The same happens for 3 and |3|.
>
> Being most likely a problem caused by incorrect trigger settings in
> the InLine procedures, here it is what we are using:
>
> WritePort &H378,1
> WritePort &H378,0
>
> WritePort &H378,3
> WritePort &H378,0
>
> WritePort &H378,7
> WritePort &H378,0
>
> If anyone is familiar with E-Prime triggers and has a suggestion to
> give, I would greatly appreciate.
>
> Thank you,
> vinz.
>
>
>
>
> On Aug 17, 9:19 am, liwenna <liwe... at gmail.com> wrote:
> > Hey,
> >
> > I looked around a bit and I think the link in this page downloads a
> > estudio file with subliminal exposure in it:
> http://www.docstoc.com/docs/5417962/Instructions-for-running-the-E-Pr....
> > It's part of some book... and it also mentions some other usefull
> > things. I think there really isn't all that much special to the design
> > of a subliminal task... simply make the exposureduration on the
> > primeslide really short (dependent on the exact nature of your task)
> > and ussually you'll want to show a mask right after your prime but
> > this is, again, dependent on the nature of your task. Then consider
> > options like enabling preloading and disabling showafter (all should
> > be explained in the mentioned chapter in the user-guide), and make
> > sure that your hardware is actually capable of subliminal
> > presentation.
> >
> > Greetz,
> >
> > liwenna
> >
> > On Aug 17, 8:25 am, Kim Janssens <kim.jansse... at gmail.com> wrote:
> >
> > > Hello liwenna,
> >
> > > Thank you for your fast reply: the advice on the refresh rate is really
> > > helpful! If I come across any specific problems when building, I will
> post
> > > my question again.
> >
> > > greetz,
> > > Kim
> > > ps: do you know where i could find an example of experiments designed
> for
> > > subliminal priming? they could help me on the way..
> >
> > > 2009/8/15 liwenna <liwe... at gmail.com>
> >
> > > > Hello Kim,
> >
> > > > Perhaps you could elaborate a bit on what part of designing the
> > > > experiment you need help with.
> > > > In general I think you should start with reading chapter 3 and
> > > > appendix A of the user guide (top of my head), which deal with timing
> > > > issues, obviously important for subliminal priming. Only other thing
> > > > that I can think of now is the monitor issue... make sure that you
> use
> > > > a monitor (when doing the experiment) that is actually capable of
> > > > subliminal-range exposure time i.e. has a sufficiently high enough
> > > > refresh rate.
> >
> > > > I'm guessing that you're relatively new to e-prime (forgive me if I'm
> > > > wrong there). I think it's the most easiest if you simply start
> > > > building and post back here with problems that you encounter along
> the
> > > > way.
> >
> > > > Good luck with it!
> >
> > > > liwenna
> >
> > > > On Aug 14, 2:20 pm, kimio <kim.jansse... at gmail.com> wrote:
> > > > > Hello group,
> >
> > > > > I want to design an experiment in eprime in which I want to show
> the
> > > > > participants a set of pictures and subliminally prime them with a
> word
> > > > > in between the pictures.. Does anyone have any experience with
> this?
> > > > > All help is welcome...
> >
> > > > > thanks,
> > > > > Kim
> >
>

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