recording response

[David McFarlane]

Linda,

"Input mask" is E-Prime lingo for the facilities that actually 
collect a response -- it is a core concept of E-Prime, although I do 
not know anywhere where it is well described or explained.  But note, 
for instance, that when you add a Keyboard as an "input mask" to a 
stimulus object, that input mask is not strictly a part of the 
stimulus object, it in fact runs independently from and concurrently 
with its associated stimulus object.  That is how "extended input" 
(see Appendix C of the User's Guide) works.

Anyway, glad you got it to work the way you want, but here is what 
still baffles me:  From what you describe your trial works as 
follows.  You run a Slide object for 500 ms.  The subject may respond 
during that time -- you do not specify what happens if the subject 
does respond then, do you terminate the Slide or does it complete its 
500 ms?  Regardless, if the subject responds then you move on to the 
next trial.  If the subject does not respond then (using a Wait 
object) *the Slide remains on the screen* while the subject gets some 
extra (unspecified) time to respond.

So in effect, the Slide simply remains visible until the subject 
responds or the end of the Wait period, whichever comes first.  Well, 
if that is all you wanted, you could have simply given the full 
Duration to your Slide in the first place, and set End Action to 
Terminate.  It just seems to me that you are going through extra 
trouble in order to do something trivial, and I feel the need to 
clarify this so that others who later stumble onto this thread do not 
make the same mistake.  So what am I missing?

Finally, if you have not already, I will give you the same advice 
that I give over and over again here -- before you write your first 
experiment in E-Prime, you *must* work through *all* of the tutorials 
in the Getting Started Guide and User's Guide that came with E-Prime, 
otherwise you just do a disservice to yourself and everyone 
else.  (And "all" includes Appendix C of the User's Guide.)  As 
insufficient as those Guides are, some folks at PST worked very hard 
to produce them for us, so we owe it to them to make use of whatever 
they did provide us.

-- David McFarlane, Professional Faultfinder


>In theory in the properties of the ImageDisplay I could indicate the
>duration time (500ms) and the response time limit. The problem is if I
>indicate a response time limit longer than the duration time e-prime
>does not wait the response and go to the next trial after 500ms
>without recording the response. I employed a Wait to this reason.
>
>What is an input mask?
>
>I fixed the problem with the liwena's inline. :-)
>
>Best
>
>Linda
>
>On Jul 7, 6:20 pm, David McFarlane <mcfar... at msu.edu> wrote:
> > Linda,
> >
> > Hmm.  I wonder what task you want to perform, because offhand this
> > design seems very clumsy -- You present an ImageDisplay for 500 ms,
> > then follow that with a Wait object, but since a Wait object does not
> > replace the previous visual display, this means that the subject will
> > continue to see the ImageDisplay during the Wait.  Why would you do
> > such a thing?  Then you go and collect a response to the Wait, which
> > you do not want.  Why did you add an input mask to the Wait object in
> > the first place?  If you just remove any input mask from the Wait
> > object, then you will not get two responses, which seems to be what
> > you are asking about.
> >
> > I must be missing something.
> >
> > -- David McFarlane, Professional Faultfinder
> >
> > At 7/6/2011 10:43 AM Wednesday, you wrote:
> > >I have a problem with E-prime.
> > >I have an image display (my stimulus) and the subject can respond when
> > >they see this slide but it is really fast (500ms) then after this
> > >image display I used a wait. The problem is that the subjects can
> > >respond when there is the stimulus and also when there is the wait. If
> > >the subjects respond when there is the stimulus e-prime show equally
> > >the wait. I would like to say to the program that if the subjects
> > >respond when there is the stimulus it doesn't employ the wait. Because
> > >now the program record two responses if the subject respond twice.
> >
> > >I hope I was clear.
> >
> > >Linda

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