Basic 1-Back Task
Jaap MurreBrief demo of a 1-Back Task to get a feeling for how this task is often implemented. Stimuli are digits 1, 2, and 3 and order is fully random (and may differ per subject). Feedback is given at the end. Runs with keyboard, mouse, and touch screen.
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var i, e, current, last, correct = 0, same_ones = 0, incorrect = 0,
same = addblock(44,90,12,7).button("Same");
main.setfontsize(60);
instruction('Watch the numbers on the screen. If a number equals the one <b>just seen before</b>, '
+ 'tap or click the "Same" Button or press the space bar. Else, do nothing.<br /><br />'
+ 'When you click OK below, the experiment will start immediately.');
await(1000);
for (i = 0; i < 20; i++)
{
current = randint(1,3); // random number 1 to 3
text(current,300);
if (current === last){
++same_ones;
console.log("Same");
waitfor {
e = same.await('click',1000);
} or {
e = awaitkey(' ',1000);
}
if (e.type !== 'timeout') {
++correct;
console.log("correct: ",correct," out of ",same_ones);
}
}
else {
waitfor {
e = same.await('click',1000);
} or {
e = awaitkey(' ',1000);
}
if (e.type !== 'timeout') {
++incorrect;
console.log("false alarms: ",incorrect);
}
}
last = current;
clear();
await(1000);
}
text('You had ' + correct + ' out of ' + same_ones + ' similar ones correct '
+ 'and you responded ' + incorrect + ' times when the digits were in fact different.');
same.button('Exit').await('click');
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