Millisecond Forums

Hello,
I'm new to Inquisit and want to program a paradigm. During each one of three blocks two kind of stimuli shall be presented randomly 50 times. Hence, I made a list containing from which for each trial the stimuli are taken randomly. However, I like to implement one restriction namely I do not want more than three instances of the same stimulus to be presented consecutively. I'm not sure, whether there is already a tool that I can use or whether an expression is needed ... Though, any suggestions on how to solve this issue would be very much appreciated!
With the same task I do have another maybe related issue. After choice of the stimulus a correct response is followed either by positive or no feedback. For correct responses the ratio of positive:no feedback is fix and again I made a list where the kind of feedback is randomly drawn from. But in case a incorrect response is given, I would like to reduce the "no feedbacks" in that list by one. Again I would appreciate any suggestions very much.
I case I did not manage to make myself clear, I also post the code I've written.
Best
Julia


<list targettype>
/items = ["trial.short"; "trial.long";]
/ itemprobabilities = (0.5; 0.5;)
/poolsize = 64
/selectionmode = random
</list>

<list corr_feed_short_80>
/ items = ( 1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,1,1,2,2,2,2,2,2,2,2)
/selectionmode = random
/replace = false
</list>

<list corr_feed_long_20>
/ items = ( 1,1,1,1,1,1,1,1,2,2,
2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,2)
/selectionmode = random
/replace = false
</list>

<expressions>
/fb1 = if (values.corr_feed_short_80 == 1) "Richtig!!
5 ct gewonnen.";
 if (values.corr_feed_short_80 == 2) " "
/fb2 = if (values.corr_feed_long_20 == 1) "Richtig!!
5 ct gewonnen.";
 if (values.corr_feed_long_20 == 2) " "

</expressions>
**************************************************************************************************************************************************************************
**************************************************************************************************************************************************************************
Blocks
**************************************************************************************************************************************************************************
**************************************************************************************************************************************************************************
<block 1von4>
/ onblockbegin = [values.targettype=list.targettype.nextvalue; values.trialcount+=1]
/ trials = [1-60 = noreplace(short, long)]
</block>

**************************************************************************************************************************************************************************
**************************************************************************************************************************************************************************
Trial elements
**************************************************************************************************************************************************************************
**************************************************************************************************************************************************************************
if (values.cuetype == 1 && values.correctresp != 0) {values.count_gocue_gotarget += 1}

<trial short>
/ stimulustimes = [0=blankscreen, fixation; 500=cue; 1000=short; 1100=blankscreen, cue]
/ validresponse = ("k","l")
/ correctresponse = ("k")
/ responsetrial = ("k", FbPosShort)
/ responsetrial = ("l", FbNoneShort)
/ recorddata = true
</trial>

<trial FbPosShort>
/ ontrialbegin = [values.corr_feed_short_80=list.corr_feed_short_80.nextvalue; values.trialcount+=1]
/ stimulustimes = [0=blankscreen, feedback1]
/ timeout = 1700