Displaying data

[rbruno1]

Hi. I am trying to make my experiemtn display and record data in a clean way. this is the source code for one of my trials:
'''
const Tur_AV_trial_10 = {
type:'video-keyboard-response',
stimulus: [
'mushroommuffin0j.mp4'
],
post_trial_gap: 1000,
choices: ['f', 'j'],
data: {condition: 'AVTur', correct_response: 'j'},
width:1000
}
'''
What do i need to add to this code and the "on_finish:" section in my Jspsych.init to get data on the participants accuracy and whether they had a correct response?

Thank you

[becky-gilbert]

Hi @rbruno1! To score each response as correct or incorrect, you can add an on_finish parameter to the trial that compares the correct response (which you've already stored in the trial data) with the participant's response (which is added to the trial data when the trial is finished). It would look like this:

const Tur_AV_trial_10 = {
  // other parameters...
  on_finish: function(data) {
    data.correct = jsPsych.pluginAPI.compareKeys(data.response, data.correct_response);
  }
}

This code will add a correct property to the data for each trial. Its value will be true if the response matches the correct response, and false if not.

You can take a look at the Manipulating Data section of the Simple Reaction Time tutorial for another example and explanation of scoring the response from each trial. And there's a section about Data Aggregation to get a performance summary across trials, if you're interested in that too.

I hope that helps. Let us know if you have any other questions.

[rbruno1]

hi. It is telling me that data is not defined. I thought i defined it in this code: "data: {condition: 'AVTur', correct_response: 'j'},"

[becky-gilbert]

Sorry, just noticed an error in my response. The on_finish function automatically takes the trial data as an argument, which I forgot to include. So it should look like this:

on_finish: function(data) {
  // ...
}

[rbruno1]

you are amazing.