Millisecond Forums

So what exactly are you having trouble with? Note that what you outline does not seem overly complicated. You should be able to get a basic version going after completing the tutorials and working through a few more elaborate scripts available in the Task Library.

I tried to modify Dot Estimation Task and reached some effects but I think I overcomplicated the whole script.

I used script, I managed to change stimuli, than used "branch" but for now I have few problems:

1. I used three trials (presentation, question "do you need to repeat?" and estimate) but I would be happy if I have only two displays in each trial - presentation => estimation (if answer is not 1-6 => repeat of presentation)

2. I cant manage to define "branch" that the stimulus would be repeated until subjet press 1-6 key, after one repetition script moves one to next presentation.

3. For now if subject presses "repeat", script presents another (next) digit rather than presented before.

I'm not sure if I should paste modified script here - it is long.

That can be handled via /branch or simply set the /response attribute to 'correct' (details in the documentation).

See above.

You need to prevent stimulus selection in case of a 'repeat' response. This can be done via conditional logic in /ontrialbegin attributes. However, all you should need is /response=correct.

Thank you for response Dave but I'm not sure if /response=correct is enough. It's because if subject was presented with e.g. "5", the correct answer is "5", other (1,2,3,4,6) are incorrect but allow subject to proceed and every other keys are also incorrect but provide to repeatition of previous digit. Am I correct?

Yes, you are. I missed that. Then using /branch along with preventing stimulus selection it is.

Ok, I'll try form scratch.

Here's a bit of code which might give you some ideas to build from:

<values>
/ currentdigit = 0
/ allowablekeys = "2,3,4,5,6,7"
/ lastresponse = 0
</values>

<text mydigit>
/ items = ("<%values.currentdigit%>")
</text>

<counter randomdigit>
/ select = replacenorepeat(1-6)
</counter>

<trial maintrial>
/ ontrialbegin = [values.currentdigit=counter.randomdigit.selectedvalue]
/ ontrialend = [values.lastresponse=trial.maintrial.response]
/ stimulusframes = [1=mydigit]
/ validresponse = (2,3,4,5,6,7,8,9,10)
/ iscorrectresponse = [trial.maintrial.response==values.currentdigit+1]
/ branch = [if (contains(values.allowablekeys, values.lastresponse)==false) trial.repeattrial]
</trial>

<trial repeattrial>
/ ontrialend = [values.lastresponse=trial.repeattrial.response]
/ stimulusframes = [1=mydigit]
/ validresponse = (2,3,4,5,6,7,8,9,10)
/ iscorrectresponse = [trial.repeattrial.response==values.currentdigit+1]
/ branch = [if (contains(values.allowablekeys, values.lastresponse)==false) trial.repeattrial]
</trial>

<block myblock>
/ trials = [1-12=maintrial]
</block>

Thank you.

Your
code was extremely helpful. On a basis of it I managed to prepare whole
script for my experiment. I have some details and instructions to
prepare but engine is ready. Thank you again!