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If I understand your short description correctly, you should set up four <trial> elements
<defaults> / inputdevice = mouse </defaults>
*** compatible trials *** <trial aa> / stimulusframes = [1=a_pic, a_statement, true, false] / validresponse = (true, false) / correctresponse = (true) </trial>
<trial bb> / stimulusframes = [1=b_pic, b_statement, true, false] / validresponse = (true, false) / correctresponse = (true) </trial>
*** incompatible trials *** <trial ab> / stimulusframes = [1=a_pic, b_statement, true, false] / validresponse = (true, false) / correctresponse = (false) </trial>
<trial ba> / stimulusframes = [1=b_pic, a_statement, true, false] / validresponse = (true, false) / correctresponse = (false) </trial>
that display either congruent pictures and statements (aa, bb) or an incongruent combination (ab, ba). Run those trials as needed in your blocks. For the response options, you need to set up a couple of <text> elements (<text true>, <text false>), and have your trials display them on screen via /stimulusframes. For all stimuli, use their /position attributes to place them where you need them to be on the screen. /inputdevice ought to be set to mouse.
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