Go/No-Go Task Demo Experiment Run Experiment

Go/No-Go Task

Jaap Murre

This is a fairly typical implementation of the Go/No-Go Task, which takes about 2.5 min. It is suitable for use in lectures, where the audience can take the test on a laptop (keyboard) or mobile phone (touch screen). Feedback is given (including d-prime based on Hits and False Alarms).

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var i, coords = [[30,30],[51,30],[30,51],[51,51]], // [[top%,left%],[top,left]...]
    blocks = [], r, stimululus, e, hits = 0, false_alarms = 0,
    yes = addblock(44,90,12,7,"lightgrey","Yes"),
    trials = shuffle([1,1,1,1,1, 1,1,1,1,1, 1,1,1,1,1, 2,2,2,2,2]);

instruction("Tap or click the Yes Button or space bar as soon as you see a P but never when you see an R.")

for (i = 0; i < coords.length; i++) { // block with and height is 19%
    blocks.push(addblock(coords[i][0],coords[i][1],19,19,'lightgrey').text('*',300)); // * of size 300%
}


for (i = 0; i < trials.length; i++) 
{
    await(500 + random(500));
    stimulus = trials[i] === 1 ? 'P' : 'R'; // 75:25 chance of P or R
    r = randint(0,3); // Which block?

    blocks[r].text(stimulus,200);
    
    waitfor {
        e = awaitkey(' ',1000); // Wait for space but no longer than 1500 ms
    } or {
        e = yes.await('click',1000);
    }
    
    if (e.type !== 'timeout' && stimulus === 'P')
    {
        ++hits;
    }
    
    if (e.type !== 'timeout' && stimulus === 'R')
    {
        ++false_alarms;
    }
    

    await(300);
    blocks[r].text('*',300);
}

for (i = 0; i < blocks.length; i++) // Remove ('destroy') all blocks
{
    blocks[i].destroy();
}

text('You had ' + hits + ' (out of 15) correct and ' + false_alarms + ' false alarms ("Yes" on R).

' + 'This gives a d-prime measure of ' + stat.dprime(hits,false_alarms).toFixed(2) + '

Use the "Exit Button" to leave the experiment'); yes.text("Exit"); yes.await('click'); yes.destroy(); clear();
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