Go/No-Go Task
Jaap MurreThis 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 <b>Yes Button</b> 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).<br /><br />'
+ 'This gives a d-prime measure of ' + stat.dprime(hits,false_alarms).toFixed(2)
+ '<br /><br />Use the "Exit Button" to leave the experiment');
yes.text("Exit");
yes.await('click');
yes.destroy();
clear();
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