Sending a trigger during a stimulus' presentation

[David Hairston]

It seems to me that if all you want is a trace of the response having happened, and are not concerned with other data on-line, then it might be easier to just bypass E-prime altogether. Look into the hardware for your response pad; most equipment has an additional line out. You could run this to an ADC line (surely you have one on the EEG recording unit). That channel will then tell when the subject responded.
Just a thought.

Dave


-----Original Message-----
From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On Behalf Of Fabrizio Ferri Benedetti
Sent: Monday, January 29, 2007 5:26 PM
To: eprime at mail.talkbank.org
Cc: Peter Quain
Subject: Re: Sending a trigger during a stimulus' presentation


 Hi Peter,

> what are you sending triggers to? EEG unit?

 Yes.

> if accuracy or no response is all the info you 
> want, why not just blend behavioural file with 
> EEG for sorting purposes.

 I'm not sure about what you mean by "blending"; of course, comparing an
E-Prime output file with 500 stimuli with an equivalent EEG recording,
can be quite a painful task if done manually. That's why I wanted to
display the response in the EEG recording even during the inter stimulus
interval. 

>e-prime executes code sequentially, so can't send triggers in the 
> middle of an object that is executing

Bad news then :-(

 Thanks anyway,

       Fabrizio

> 
> 
> 
> At 04:38 AM 30/01/2007, you wrote:
> 
> >Hi!
> >
> >I'll try to make it simple:
> >
> >- In my procedure, an InLine BEFORE the stimulus 
> >send a start trigger via serial port using OnSet 
> >method; an InLine AFTER the stimulus send 
> >triggers accounting for accuracy or lack of 
> >response (as the subject's answer terminates the slide)
> >
> >-In the same procedure, there is also a 
> >fixed-time pause after the stimulus. It happens 
> >that the subject may answer during the pause, 
> >and not during the stimulus. Now, as the pause 
> >(an empty slide) can't be terminated by the 
> >subject's answer, every trigger I process with 
> >an InLine after the pause itself will always be sent after the pause.
> >
> >Is there any way to send triggers (or perform 
> >actions) if the subject answers during the 
> >presentation of a stimulus 
> >(slide/text/pause/etc)? That is: I don't want 
> >the answer to terminate the stimulus or pause; I 
> >just want the answer to perform scripted actions 
> >(like sending triggers) along the duration of the slide.
> >
> >Hope I made myself clear...
> >
> >Cheers,
> >
> >Fabrizio
> >
> >--
> >Fabrizio Ferri Benedetti
> >Departamento de Psicología Evolutiva y Educativa
> >Facultad de Psicología
> >Universidad de Valencia
> >http://www.uv.es/fafebe
> >
> >
> >
> >
> >
> >
> >--
> >No virus found in this incoming message.
> >Checked by AVG Free Edition.
> >Version: 7.1.410 / Virus Database: 268.17.12/655 - Release Date:
28/01/2007
> >
> 
> Peter Quain
> School of Psychology
> University of New England
> Armidale, Australia, 2351
> Phone:  02 6773 5193
> Fax:      02 6773 3820
> 
> 
> --
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> Checked by AVG Free Edition.
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28/01/2007
> 
> 
> 
> 
> 


--
Fabrizio Ferri Benedetti
Departamento de Psicología Evolutiva y Educativa
Facultad de Psicología
Universidad de Valencia
http://www.uv.es/fafebe