Can Eprime work with Neuroscan?

[Richard P. Heitz]

Yea, I've considered all of those possibilities already.
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Richard P. Heitz, M.S.
Attention and Working Memory Lab
Georgia Institute of Technology, Atlanta Georgia 30332
Email: gte016z at prism.gatech.edu
Office: 350 J.S. Coon Building
Web: http://psychology.gatech.edu/renglelab
----- Original Message ----- 
From: "Stephen D. Benning" <benn0224 at umn.edu>
Cc: "eprime" <eprime at mail.talkbank.org>
Sent: Tuesday, February 24, 2004 9:55 AM
Subject: Re: Can Eprime work with Neuroscan?


> On Tue, 2004-02-24 at 08:01, Richard P. Heitz wrote:
> > I'm using a neuroscan with E-Prime, and am having a problem with
triggers
> > getting through (I've posted this problem before).  I haven't found any
> > remedies.  I randomly lose approximately 7% of all triggers.  Leon, if
you
> > end up having this problem too, I'd like to hear about it.
>
> A few questions that might help debug your problem, listed in order of
> decreasing probability:
>
> 1)  Do you have any statements of the variety (assuming that 0 is your
> "hold value"):
>
> WritePort TriggerPort, 0
> WritePort TriggerPort, TriggerValue
>
> or
> WritePort TriggerPort, TriggerValue1
> WritePort TriggerPort, 0
> WritePort TriggerPort, TriggerValue2
>
> If so, it's likely that the port can't be consistently reset to the hold
> value before the next trigger comes.  Therefore, you won't have
> consistently occurring triggers.  To remedy this problem, you can use
> code like this (if all else fails):
>
> WritePort TriggerPort, 0
> Sleep 1
> WritePort TriggerPort, TriggerValue
>
> This will force E-Prime to pause for a millisecond to allow the hold
> value to be written.  You may need to adjust program timing to account
> for this 1 ms slop, though.
>
> 2)  Are you having more programs than just E-Prime running when you're
> running your experiment?  IF so, Windows might be calling those programs
> at unexpected times (though if this were the case, I'd expect to see
> random pauses in the experiment altogether, rather than just trigger
> dropping).
>
> 3)  Is the cable connecting your output port to the Neuroscan unit
> firmly attached?  Sometimes flaky cable attachments can drift off at the
> oddest times.
>
> 4)  Is your parallel port working consistently?  Likewise, is the
> Neuroscan equipment EVER able to receive triggers consistently?  IF not,
> you may have a hardware problem.
>
>
> --------------------------------------------------------------------------
--
> > ----------
> > Richard P. Heitz, M.S.
> > Attention and Working Memory Lab
> > Georgia Institute of Technology, Atlanta Georgia 30332
> > Email: gte016z at prism.gatech.edu
> > Office: 350 J.S. Coon Building
> > Web: http://psychology.gatech.edu/renglelab
> > ----- Original Message ----- 
> > From: "Jan Seifert" <seif1301 at uni-trier.de>
> > To: "eprime" <eprime at mail.talkbank.org>
> > Sent: Tuesday, February 24, 2004 5:00 AM
> > Subject: Re: Can Eprime work with Neuroscan?
> >
> >
> > > eprime，hello！
> > > I am now conducting an ERP study using Neuroscan scanner. I want to
> > program with Eprime instead of Stim. But I find I can only send a
stimuli
> > onset or offset signal(by
OnsetSignalEnabled,OnsetSignalPort,OnsetSignalData
> > function)  to the scanner and cannot send other signals like response to
the
> > scanner. How can I slove this problem?
> > > Is there any other way to make E-prime work together with Neuroscan?
> > > 　　
> > >
> > >
> > > Best Wish!
> > >
> > > 　　　　　　　　　　　　　　                    Leon
> > Hello,
> >
> > you can send triggers anytime and anywhere with the "WritePort" command.
> > Something like this:
> >
> > WritePort NEUROSCANTRIGGERPORT,ATrigger
> >
> > Hope this helps
> > Jan
> >
> > \
> > / Jan Seifert
> > / Fachbereich I - Psychologie
> > / Universitätsring 15
> > / 54296 Trier
> > \
> > / +49 651 201 2896
> > \ seif1301 at uni-trier.de
> > / http://eeglab.uni-trier.de/users/seifert/index.php
> > \
> -- 
> Stephen Benning
> Office: N631 Elliott Hall
> 75 East River Road
> Minneapolis, MN  55455
>
>