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Dear David, thank you very much for your kind help! It works perfectly! Best greetings and have a good day!

Look at/ branch = [if (openended.MVRVM.error && openended.MVRVM.count = 3) trial.konzentration]

Dear Dave, in regard to the above mentionned experiment I have another question: Participants are presented letter of strings. After the presentation they shall remember the presented string of letters (typing via keys). If participants do not remember the string correctly, the string of letters reappears. After any third incorrect entry, participants shall be reminded to try not to make mistakes (<text stimuli>) and, then, a NEW string shall be presented on the next trial. I tried to write a branch, in which the text stimuli appears after three incorrect answers. Unfortunatelly, it does not work. I think, I would have to integrate <trial konzentration> within the <block training>. But I do not know how. Furthermore, I am uncertain weather I am allowed to integrate a <trial> (trial konzentration) within an <openended> ?<openended MVRVM>
/ stimulustimes = [0=fixation; 1000=MVRVM; 5000=mask]
/ validresponse = (anyresponse)
/ correctresponse = ("MVRVM")
/ branch = [if (openended.MVRVM.error && openended.MVRVM.count < 3) openended.MVRVM]
/ branch = [if (openended.MVRVM.error && openended.MVRVM.count = 3) trial.konzentration]
</openended>

<openended VMRMVRV>
/ stimulustimes = [0=fixation; 1000=VMRMVRV; 5000=mask]
/ validresponse = (anyresponse)
/ correctresponse = ("VMRMVRV")
/ branch = [if (openended.VMRMVRV.error && openended.VMRMVRV.count < 3) openended.VMRMVRV]
/ branch = [if (openended.VMRMVRV.error && openended.VMRMVRV.count = 3) trial.konzentration]
</openended>

<openended VMRMVXR>
/ stimulustimes = [0=fixation; 1000=VMRMVXR; 5000=mask]
/ validresponse = (anyresponse)
/ correctresponse = ("VMRMVXR")
/ branch = [if (openended.VMRMVXR.error && openended.VMRMVXR.count < 3) openended.VMRMVXR]
/ branch = [if (openended.VMRMVXR.error && openended.VMRMVXR.count = 3) trial.konzentration]
</openended><block training>
/ trials = [1-16 = noreplace(MXRVXT, VMTRRRR, MXTRRR, VXVRMXT, VXVRVM, VMRVVVV, MXRTMVR, VMRMXTR, MXR, VMRVXVR, MVRVM, VMRMVRV, VMRMVXR, MXRTVXT, MXRMVXR, MVXTR)]
/preinstructions = (wellcome, training_instruktion)
</block>

Great!

Dear Dave, thank you very much for your kind help. It works perfectly! Best greetings!

<openended> elements' /stimulusframes and /stimulustimes attributes work exactly like <trial> elements'. And if your Inquisit installation is up-to-date, the box will not be shown until the last stimulus given in the attribute has been displayed./ stimulustimes = [0=FIXATION; 500=LETTERSTRING; 1000=MASK]would display FIXATION at the start of the <openended> trial, a LETTERSTRING 500ms later and a MASK another 500ms later. The textbox will only show up after the MASK has been displayed.

Dear Dave, your suggestions of following branches

Dear Dave, thank you very much for your help! I will implement your recommendations! Best greetings and have a good day.

Well, no, those /branches won't do that. Particularly, nowhere in your syntax do you instruct the script to repeat a given trial in case of an incorrect response. The correct way to go about this is:<block myblock>
/ trials = [1-2=noreplace(ab, cd)]
</block>

<openended AB>
/ stimulusframes = [1=typeAB]
/ validresponse = (anyresponse)
/ correctresponse = ("AB")
/ branch = [if (openended.ab.error && openended.ab.count < 3) openended.ab]
</openended>

<text typeAB>
/ items = ("Type the letters 'AB'")
/ position = (50%, 40%)
</text>

<openended CD>
/ stimulusframes = [1=typeCD]
/ validresponse = (anyresponse)
/ correctresponse = ("CD")
/ branch = [if (openended.cd.error && openended.cd.count < 3) openended.cd]
</openended>

<text typeCD>
/ items = ("Type the letters 'CD'")
/ position = (50%, 40%)
</text>

And also: Thank you for the mark #4: this was a mistake!