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Forum Newbie
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Last Login: 4/28/2008 11:09:41 AM
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| I work on an fMRI memory paradigm and I used E Prime to create the experiment which is very simple. My stimuli are single words that the subject sees and he has to respond by pressing a button (4) if he is sure he recognizes the word, an other button (6) if he thinks he recognizes it but he is not sure and he doesn't respond if he thinks it is a new word. In the DoTrial section, I have a problem with the CorrectReponse Attribute. In fact if the stimulus is a target, the correct response is the press of button 4 or 6. If the stimulus is a foil, the correct response is : no response. I don't know if E Prime can do that and how to programm it. Another problem is that when the subject doesn't give any response to a target while E Prime wait for a button press (4 or 6), sometimes in E data, it doesn't write any value in the column StimulusCorrectResponse: we should have the name of the button press (4 and 6) in that column ??? Finally, in E data, what is the difference between the column CorrectResponse and StimulusCorrectResponse ? I am sorry to ask so many questions and I would gladly give more details about the experiment if necessary. Sincerely yours
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Forum Member
Group: Forum Members
Last Login: 4/9/2008 3:40:25 AM
Posts: 25,
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1.) If you have the attribute "CorrectRSP" in your trial list (can be empty) this Inline will set it depending on a other attribute here I used “StimuliType” (but I looks to me as if this could be only a part of the solution?)
If c.GetAttrib ("stimulusType") = "target" then
c.SetAttrib "CorrectRSP", "46"
else
c.SetAttrib "CorrectRSP", ""
End if
2.) >>Finally, in E data, what is the difference between the column CorrectResponse and StimulusCorrectResponse ?
CorrectResponse is a attribute where you can tell E-Prime what the right answer would be (within a trial). Usually it is used in the triallist.
StimulusCorrectResponse is what is written (or reffered) into the field “Correct” under the “Duration/Imput” section of the “Properties” of the object called Stimulus.
Hope that helps
Patrick
Patrick
Randomization: rqube.seifseit.de
Internet: http://eeglab.uni-trier.de
or: http://britz.wordpress.com
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