feedback display problem with incorrect state

[David McFarlane]

Güzin,

Well, I hate to encourage people to send me their 
files, much less encourage them to attach files 
for everyone on the Group, but I have to admit 
that this puzzle intrigued me, and the example was well constructed.  So...

Sigh.  Why do I keep having to do PST's debugging 
for them?  Yes, you have uncovered an 
honest-to-goodness bug.  But first, let me 
explicate a little more of the misbehavior in your example.

First, your car.jpg image never appeared at 
all.  That was just because your image did not 
properly fit in the frame of the ImageDisplay 
sub-object on your slide.  You can fix that in a 
variety of ways, and that is *not* a bug in EP.

Next, not only does EP fail to show an image for 
the first incorrect response, but after that, any 
time you enter a correct response, the *next* 
incorrect response will use the image belonging 
to the previous *correct* response!

How?  This all becomes clear when you look 
through the generated E-Basic code.  The code 
first loads an image based on the *current* 
ActiveState of the FeedbackDisplay; but it does 
not change the ActiveState to Correct, Incorrect, 
etc., until later!  It is just that simple.

Note that you used EP2.0.10.182, the latest 
release of EP.  By contrast, both good-old EP1.2, 
and EP2.0.8.90 (the previous public release), 
generate FeedbackDisplay code in the correct order and do not have this bug.

Thank you for bringing this bug to public 
attention.  You should submit this to PST Web 
Support so that they may take action to fix this; 
I will do the same.  Until then, despite the real 
advances of EP2.0.10.182, users may want to hold 
off on upgrading and stick with EP2.0.8.90, as 
this seems like a fairly egregious programming mistake.

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


At 4/20/2012 03:04 AM Friday, you wrote:
>I have already searched for  that problem in the pst forum.
>I have found a similiar problem, but there was 
>not a reply or solution for that problem. You can see the thread below:
>
><http://dedicated.pstnet.com/forum/Topic5723-23-1.aspx?Highlight=feedback>http://dedicated.pstnet.com/forum/Topic5723-23-1.aspx?Highlight=feedback
>
>Since anybody wrote an answer for that problem 
>in the forum I decided asking to this group.
>
>I tried to change filename, attribute name, 
>image type (as bmp, png jpg) etc. but problem is stil continuing.
>I am sending an example of my problem at the 
>attachment. This is not my actual experiment, 
>only a small example to show my problem.
>
>On 19 Nisan, 19:49, David Vinson 
><<mailto:d.vin... at ucl.ac.uk>d.vin... at ucl.ac.uk> wrote:
> > Hi Güzin,
> >
> > Your problem sounds like a tricky one 
> indeed.  If I understand your message, on the 
> first incorrect trial the "Incorrect" feedback 
> screen is displayed, but without the desired 
> image. On all other trials the feedback is displayed correctly.
> >
> > At first I thought there could be a problem 
> with the assignment of a filename via the FB 
> attribute. But this should produce an error if 
> a filename is not assigned to an image when it is meant to be displayed.
> >
> > One question is whether the "incorrect" 
> feedback slide is actually being displayed on 
> the problematic trial. That is, is the 
> incorrect feedback display occurring but 
> failing to load the desired image?  Or is the 
> incorrect feedback failing to display at 
> all?  this is easy enough to test, just add 
> some text on the "Incorrect" slide in addition to your desired image.
> >
> > Another angle would be to try and add a brief 
> interval (e.g. Wait 100) between your response 
> object and its feedback screen. This might be 
> superstitious behaviour on my part but 
> sometimes I find this sorts out "unusual" behavior with feedback displays.
> >
> > Please report back and let us know how it turns out.
> > -dv
> >
> > On 19/04/2012 10:28, SGuzin wrote:
> > > I have a problem with feedback display. In incorrect state of feedback
> > > slide I put an image display which gets the images from the FB
> > > attribute(fb1.jpg, fb2.jpg, fb3.jpg, fb4.jpg) in the list. When the
> > > participant’s answer is incorrect for the first time, feedback screen
> > > comes as blank (I mean image does not appear). But for the second time
> > > for rest of the answers image appears on the screen. I have randomized
> > > question to see whether is there a problem with images. But always
> > > only first time image does not appears not being dependent on which
> > > image.
> > > I tried to put image display on correct state, but there were no
> > > problem.
> > > I do not understand why the incorrect feedback comes blank for the
> > > first wrong answer and not for the others.
> > > I will be thankfull if you can  help me whith this.
> > > Güzin

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