Fragmented pictures with multiple inputs

[David McFarlane]

First, another general point about online disussions -- when you post 
a reply, *please* also include the previous messages from *both* 
parties, so that your correspondent can readily recall the proper 
context (look at my reply as an example).  Just a little courtesy to 
spare your correspondent and other readers some work.

So, the "criterion based exit" example shows you how to create a 
simple loop, now you just need to modify the stimulus each time 
through the loop.  You could do that just by using an attribute 
reference in your stimulus (e.g., "[FragFile].bmp", and then using 
c.SetAttrib to set the attribute each time through the loop (see the 
Context.SetAttrib in the E-Basic Help facility) according to whatever 
algorithm you devise.  You should be able to take it from there.

-----
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 8/16/2013 07:25 PM Friday, Alexandre Nobre wrote:
>Hi, David, thank you for the reply. I'm sorry for not being clear 
>about what I meant. I do have the fragmented pictures, actually. My 
>main problem is how to repeat the response slide in a single trial 
>until the participant identifies the picture correctly (which he 
>does verbally - the key press for repeating the same picture, but in 
>a less fragmented form, or for jumping to the next picture (trial) 
>is done by the experimenter). I need to have the slide change the 
>image it uses every time the participant emits a wrong response, 
>until they get it right or the last fragmented form has been displayed.
>
>I've been able to insert several slides and masks in the trial 
>procedure, so that, if the participant emits a wrong response, the 
>trial continues on to the next slide, which presents the same 
>picture in a less fragmented form. If they identify the picture 
>correctly, then he trial ends using a label. The problem with this 
>is that, because this task is done simultaneously with a dichotic 
>listening task, the number of attributes specified in the trial list 
>is becoming enormous (one sound for each slide, as well as one 
>image). I imagine that this can be done with a Inline in a less 
>sloppy way, but I'm not sure how to do this. I checked out the 
>"criterion based exit" sample you recommended, but, from what I've 
>understood, in the sample the trials are simply repeated, but not 
>modified as the experiment goes on, so I've been unable to transfer 
>it to my experiment.
>
>On Wednesday, August 14, 2013 12:32:38 AM UTC-3, Alexandre Nobre wrote:
>Hello. I'm new to E-prime and am currently trying to implement an 
>experiment on identification of fragmented pictures, but can't 
>figure out how. Each trial in the experiment should initiate with 
>the presentation of a fragmented picture, to which the subject must 
>respond verbally. If the subject identifies it correctly, the 
>experimenter initiates the next trial, with a different fragmented 
>picture. However, if the object is named incorrectly, the same 
>picture appears on the screen, but in a less fragmented form. Also, 
>I need to have six different levels of fragmentation, so that, if 
>the subject can`t identify the picture correctly on any level, the 
>next trial is initiated, with a new fragmented picture. Does anyone 
>know how to do this?

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