probabilistic stimuli

[Pauline FAVRE]

Thank you for your response. 
This seems to be a good solution. Unfortunately, the problem persists, the 
"correctFollowupImage" continue to be display even if the answer is 
incorrect (and vice versa)!
Perhaps I can use the "Feedback" object but how can I specify the 
conditional probability for correct responses (i.e. 80% of correct 
responses with one feedback, nothing for the other 20% and for no 
responses, and different feedback for incorrect responses)? 

Again, thank you very much for your help.
Sincerely,

PF

Le vendredi 25 octobre 2013 18:53:59 UTC+1, McFarlane, David a écrit :
>
> One way to do this, maybe some others will come up with alternatives... 
>
> Suppose your stimulus is named StimText, and you use an attribute 
> reference, "[FollowupImageFile]", for the image file in the following 
> stimulus.  Then in inline code after StimText and before your 
> followup stimulus, do something like the following: 
>
>      If (StimText.ACC And (PRNG.GetNext() < 0.8)) Then 
>          c.SetAttrib "FollowupImageFile", "CorrectFollowupImageFile" 
>      Else 
>          c.SetAttrib "FollowupImageFile", "OtherFollowupImageFile" 
>      End If 
>
> See the PRNG and related topics in the E-Basic Help facility. 
>
> BTW, the comparison "< 0.8" will work for all practical purposes, but 
> you might consider whether "<= 0.8" would be more canonically correct 
> -- I leave that as an exercise to the reader. 
>
> ----- 
> 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 10/23/2013 12:55 PM Wednesday, Pauline FAVRE wrote: 
> >Dear E-prime users, 
> >I try to control the occurrence of the a stimulus, i.e., during the 
> >experiment, each trial consist first of a presentation of a stimulus 
> >and then I would like that another image appears for only 80% of 
> >correct responses on the previous stimulus (and different images for 
> >the remaining 20% and the incorrect responses). 
> > 
> >In summary, I just would like that a specific stimuli appears in 80 
> >% of the cases. 
> > 
> >Is there an inline script that permit that a stimuli appears only in 
> >a determined percentage of trials? 
> > 
> >Thank you very much for your help! 
>
>

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