Stimulus marker

[David McFarlane]

Juan,

Once again, if you use EP2.0.10 or later, I think 
you can do this better with Task Events than with 
inline code.  How about the following:

Suppose you use the object StimSlide to get your 
subject response.  Make sure that it logs 
StimSlide.ACC; you might also have to set its 
PreRelease to 0 to make sure that E-Prime sets 
the StimSlide.ACC attribute before executing the 
next object.  Set up your trial Procedure something like

     ...
     StimSlide
     MarkerWait
     ...

MarkerWait is a Wait object with a Duration of 
0.  Add a Task Event at StartTime, ActionTime, or 
OnsetTime (in this case it hardly matters which, 
if you want to know the difference please see 
https://groups.google.com/d/topic/e-prime/OeiZ00V9SRc 
).   Set it to use your communications device 
(ParallelPort, Serial, etc.).  Use WriteString as 
the Action, "(custom)" as the Source, 
"[StimSlide.ACC]" for Custom, String for Data 
Type; leave Delay at 0, and Enabled at Yes.

The key is the Custom value for the Task 
Event.  If StimSlide is set to log .ACC, then 
E-Prime will automatically create the 
StimSlide.ACC attribute (though you might have to 
set PreRelease to 0 to make sure that MarkerWait 
does not try to use that attribute before its 
value is set!).  Then MarkerWait can use that as 
an attribute reference in the Custom value.

I have not tested this out myself, so I will be 
very interested to learn what you get to work.  Please write back.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)

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At 9/23/2014 10:34 AM Tuesday, juan concepcion wrote:
>Hello I need help with sending an alphanumeric 
>marker when presenting a stimulus. I have set 
>the port for communication and already have 
>successfully sent markers to another program.Â
>
>My wish now is to send markers if stimuli are 
>correct or incorrect. So for example if stimulus 
>is correct send marker "1" and if stimulus is 
>incorrect send marker "0". I need to understand 
>how  in-line script does this and what to write 
>in the in-line script for it to perform the function specified.
>
>Thank you in advance!!!
>
>Juan

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