Littles questions about Looping and Dynamics Parameters

[MatthieuFra]

Hi,

I'm trying to code an audio experiment using the best/worst scaling technique.
I understood the philosophy of jsPsych framework, and so for now I'm trying to do most of my experiment with the included plugins (before trying if needed to get into proper plugin development).

To do my experiment, I need to have a procedure like that (I'm trying to make it simple to understand before copy/pasting the code) :

---

BLOCK A :

(For every block of the experiment, I need the subject to be able to listen as many times as he wants to 4 different sounds, and then to respond with a MultiChoice survey to two questions "Wich sound was the best to represent the attribute" et "Wich sound was the worse".)

HtmlButtonResponse

4 choices :

• Sound A1
• Sound A2
• Sound A3
• Sound A4

(And a "continue" button, to move forward the loop)

AudioKeyboardResponse

Stimulus corresponding to the above choice(A1, A2, A3 or A4).
NO_KEYS response, trial end after audio.

---------- LOOP -------- ^

SurveyMultiChoice

Question 1
Question 2
Continue button.

---

BLOCK B :
(Exactly the same but with 4 others sounds from my stimuli sequence.
...

---

BLOCK n

So that's what I'm trying to get. I think that's it also possible to get all the block done with a nested timeline repeating the procedure and getting the sequence of stimuli from a .json but I'm not there yet.

My piece code so far is the following :

var ecoute1 = {   
      type: jsPsychHtmlButtonResponse,
      stimulus: `
        <p>Ecoutez ces quatres sons.</p>
      `,
      choices: ['Son 1', 'Son 2', 'Son 3', 'Son 4'],
    }; 
timeline.push(ecoute1);
    /*Suite de lecture en fonction du choix effectué*/ 
    var play1 = {
    type: jsPsychAudioKeyboardResponse,
    stimulus: "sound.wav",
    choices: 'NO_KEYS',
    prompt: '<p>Lecture son <strong>1</strong></p>',
    trial_ends_after_audio: true,
    response_allowed_while_playing: false,
    };
timeline.push(play1)
    /*Questionnaire BWS*/
    var survey1 = {   
    type: jsPsychSurveyMultiChoice,
    questions: [
     {
        prompt: "Quel est le <strong>plus</strong> XXX", 
        name: 'Meilleur', 
        options: ['Son 1', 'Son 2', 'Son 3', 'Son 4'], 
        required: true
      }, 
    {
        prompt: "Quel est le <strong>moins</strong> XXX", 
        name: 'Pire', 
        options: ['Son 1', 'Son 2', 'Son 3', 'Son 4'], 
        required: true
      },
    ],
  };
timeline.push(survey1)

Dynamic parameters :

So from that I'm not sure of how can I get modify it to get the audioKeyboardResponse to play the sound corresponding to the previous button that has been chose ?

I suppose that there's something with jsPsych.data.get() or jsPsych.data.getLastTrialData() but I don't really see how to perform it.

Loop :

To loop the sub-part of the block and allow to listen to the sounds as many times as we want, I thought that I can do something like that :

     var ecoute1 = {
       
      type: jsPsychHtmlButtonResponse,
      stimulus: `
        <p>Ecoutez ces quatres sons.</p>
      `,
      choices: ['Son 1', 'Son 2', 'Son 3', 'Son 4', 'continue'],
     /* data: {
        response: 'choix'
      } */
    };
    

    /*Suite de lecture en fonction du choix effectué*/ 
    var play1 = {
  
    type: jsPsychAudioKeyboardResponse,
    stimulus: "n_Vn-ord-C4-ff.wav",
    choices: 'NO_KEYS',
    prompt: '<p>Lecture son <strong>1</strong></p>',
    trial_ends_after_audio: true,
    response_allowed_while_playing: false,
    };

var soundChoose = jsPsych.data.getLastTrialData()[0];

var loop_node = {
    timeline: [ecoute1, play1],
    loop_function: function(data){
        if(soundChoose == 4){
            return false;
        } else {
            return true;
        }
    }
}
timeline.push(loop_node)

But It doesn't work ! So I may not think about it the right way, that's why I'm asking for some help to get more used to jsPsych!
Thanks a lot!