key logging vs. advancing to the next slide with a "t"

[David McFarlane]

Mary,

>we're using eprime 2.0.  We have our program set up so that it will
>advance to the next slide every time it receives a "t" that our MRI
>scanner sends out every 3 seconds.  We want to also be able to log our
>subject's responses on another keypad separately without moving to the
>next slide--but it seems like no matter what key we press (i.e., non-t
>keys), it will advance the slide.
>
>Apparently there's a way to do this if we add another short slide
>right after the first one that advances with a "t", but this would
>hurt our design and add more room for mistakes by adding this extra
>blank slide.  Can we both log responses and also "terminate" the slide
>for a specific key instead of any key?  (We tried going to the
>advanced button and typing in "t" for termination response and that
>did not work.  Do we have to do an in-line or something?

Perhaps, but there may be other ways.  I would explore adding a 
second Keyboard device in the Input Mask for your original Slide 
object.  It's a little known fact that you can add multiple instances 
of any input device into the Input Mask of any display object, and 
each instance can have its own settings for Allowable, Correct, Time 
Limit, and End Action (I don't know where PST documents this, if 
anywhere).  Be careful with this, it can get confusing as you have to 
click on each instance in the Input Mask box to work with the 
settings for that instance!  So anyway, keep your first Keyboard mask 
as it is, terminating the slide when it gets a "t".  Then set up your 
second Keyboard mask with End Action "(none)" so that subjects can 
press keys without terminating the slide.  Just make sure subjects do 
not press "t"!  Also, if you want to allow more than one response 
then you have to adjust that under the Advanced button.

One gotcha though, I don't know how you get all your subject response 
data out of this, I think it will store only the final "t" from the 
scanner in the .edat2 file.  You might have to use some script and 
the InputMask.Responses property to store the subject's responses to 
the .edat file.  See the InputMask.Responses topic in the online 
E-Basic Help, and/or search around on this Google group or in the PST 
Forum, some of this has been discussed before.

And if it were me I would first test out this idea in a little demo 
program for that purpose, rather than jumping right in and trying to 
make it work on my real experiment program.  Once I get the tiny demo 
to work I would apply what I learned to the real program.  Just a bit 
of strategic advice from an old hand.

-- David McFarlane, Professional Faultfinder


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