logtrial in practice
Jaap MurreDemo how to use the logtrial() function in a typical reaction time experiment.
The logtrial() function works well with the datadashboard (speedometer icon). In addition to logging just a value and a variable name, as you do with log(), you can also log the conditions.
In this example, there is one condition: Yes and No, where one has to click anywhere on text(‘Yes’) and do nothing with text(‘No’), which will lead to a timeout. In the example, we log this with:
logtrial(e.RT,“RT”,stimuli,e.type)
where stimuli is either ‘Yes’ or ‘No’ (assigned by you) and e.type is either ‘click’ (an event) or ‘timeout’ (subject did not click).
In the datadashboard, you will see the data neatly sorted according to the two conditions. These are called Con1 and Con2 (these labels cannot be changed), as follows:
| Index | Subject | Con1 | Con2 | RT |
| 1 | 62416 | |||
| 2 | 62419 | |||
| 3 | 62419 | yes | click | 1219.0200000040932 |
| 4 | 62419 | no | click | 543.8149999972666 |
| 5 | 62419 | no | timeout | 1999.9499999976251 |
| 6 | 62419 | yes | click | 739.7249999994528 |
| 7 | 62419 | no | click | 1060.1049999968382 |
| 8 | 62419 | yes | timeout | 1998.8549999980023 |
If you are a registered user and signed in, you can here copy this script and its stimuli to your own account, where you can edit it and change it in any way you want.
It is absolutely free to register (no credit card info asked!). You can then instantly copy this experiment with one click and edit it, change its accompanying texts, its landing page, stimuli, etc. Invite your colleagues, friends, or students to check out your experiment. There is no limit on how many people can do your experiment, even with a free account.
The catch? There is no catch! Just keep in mind that with a free account, you cannot collect data. For teaching that is usually not a problem. For research, prepaid data collection (unlimited subjects) starts as low as €10.00 for a 10-day period.
var stimuli = ["yes","no","no","yes","no","yes"];
var i,e;
instruction("Click only if you see 'Yes'");
await(2000);
for (i = 0; i < stimuli.length; i++) {
text(stimuli[i]);
e = await("click",2000);
logtrial(e.RT,"RT",stimuli[i],e.type);
// logtrial(1,"Accuracy",stimuli[i],e.type);
await(1000);
clear();
await(1000);
}
text("Thank you!");
await(2000);