timeout and skip to next task

[ginopino09]

Hello Jeremy,

I’m planning my next experiment and I am having some problems with the newTimer function. I already used this function to provide feedbacks but what I need this time is slightly different.
Participants will be doing task_A for 4 minutes and when the time is over (regardless how many trials they completed) they will go the next task_B.

I have two problems with what I have writted so far: 1) I get the message only when a key is pressed (so if the 4 minutes ends in the middle of a trial, the message pops out only once that trial is over). 2) I do not know how to end the present task_A and go to the next after the 4 minutes.
Any suggestion? Thank you in advance!

    Template("kbit",
    
        row => 		
        newTrial(		
           
          newTimer("kt", 240000).start(),
    	newImage(row.slide).print(),
    	newKey("ABCDEFGH").wait()
    	.settings.log(),
    	  getTimer("kt").test.ended()
            .success(clear(), getTimer("kt").stop(),
            newText("I'm sorry, the time is over").css({'font-size':'1.5vw'}).print("center at 50%", "middle at 30%"),
            newButton("go","Go to the next task").css({'font-size':'1.5vw'}).print("center at 50%", "middle at 50%").wait()),  
// ...?

[Jeremy]

Hi,

Let me know whether I understood your design correctly: you have a first block of trials labeled task_A and a second block of trials labeled task_B. In case your participant takes more than 4 minutes completing the first block (task_A) you want to prematurely end whichever trial the participant is currently on and skip all the remaining task_A trials, and jump directly to the first task_B trial.

What you can do to that end is set a global Var element before starting block task_A to a timecode corresponding to four minutes later. Then at the beginning of each trial of block task_A, you look up the current timecode and skip the trial if it’s over the timecode from the global Var element. Otherwise, you launch a Timer element that will check again later and either end the trial prematurely or re-launch itself.

Here is an example:

newTrial("pre_task_A", newVar("four_minutes_later").global().set(v=>Date.now()+4*60*1000) )

Template( row => newTrial( "task_A" ,
    getVar("four_minutes_later").test.is(v=>Date.now()>=v).success(end()).failure(  
        newTimer("check_end", 100).callback(
            getVar("four_minutes_later").test.is(v=>Date.now()>=v)
                .success( end() )
                .failure( getTimer("check_end").start() )
        ).start()
        ,
        newText("Task A").print(),
        newButton(row.stim).print().wait()
    )
) )

Template( row => newTrial( "task_B" ,
    newText("Task B").print(),
    newButton(row.stim).print().wait()
) )

Let me know if you have any questions

Jeremy

[ginopino09]

Thank you Jeremy! It worked!

[Author]

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