Block n of n?

PennController for IBEX Forums Support Block n of n?

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  • #8254

    Hi Jeremy,

    I’m in the process of creating an experiment in which participants will see many trials divided into 9 blocks separated by a break. To keep them motivated, I’d therefore like to inform them how far along in the experiment they are, e.g., “This is block n of 9.”

    Is there any way to do that? For reference, the relevant part of my code looks as follows:

    PennController.ResetPrefix(null); // Shorten command names (keep this line here))
    function SepWithN(sep, main, n) {
        this.args = [sep,main];
    = function(arrays) {
            assert(arrays.length == 2, "Wrong number of arguments (or bad argument) to SepWithN");
            assert(parseInt(n) > 0, "N must be a positive number");
            let sep = arrays[0];
            let main = arrays[1];
            if (main.length <= 1)
                return main;
            else {
                let newArray = [];
                while (main.length){
                    for (let i = 0; i < n && main.length>0; i++)
                    for (let j = 0; j < sep.length; ++j)
                return newArray;
    function sepWithN(sep, main, n) { return new SepWithN(sep, main, n); }
    // Start with welcome screen, then present test trials in a random order,
    // and show the final screen after sending the results
    Sequence( "welcome" , "instructions", "practice1" , "practice2", "practice3", "practice4", "begin", sepWithN("break", randomize("test"), 108) , "send" , "final" )

    Hi Simone,

    Your code seems perfectly fine to me (assuming you have 9 blocks of 108 test trials—if you have 9 blocks of 12 trials, you need to write sepWithN("break", randomize("test"), 12)). You could write your “break” trial like this, for example:

        newVar("block_n", 0).global().set(v=>v+1)
        newVar("text").set(getVar("block_n")).set(v=>"You've just finished block "+v+" of 9")
        newText("prompt", "").text(getVar("text")).print()


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