Looping timeline is not working to repeat a trial missed by the participant.

[prashantig25]

Dear All,

I am trying to present a trial at the end of a block of trials, when a participant fails to respond to a trial within the trial duration. I add elements to an empty list called missed each time data.key_press is null. Here is a trial:

var fix = {
        type: 'canvas-keyboard-response', stimulus: fixation, trial_duration: fix_dura, choices: jsPsych.NO_KEYS, data: { condition: 'fixation'}
    };

var fb = {
        type: 'html-keyboard-response', choices: jsPsych.NO_KEYS, trial_duration: duration,
        stimulus: function () {
            var last_trial_correct = jsPsych.data.get().last(1).values()[0].correct;
            if (last_trial_correct) {
                return "<p style=\"font-size: 30px;color: #016901\">You win 1 point!</p>";
            }
            else {
                return "<p style=\"font-size: 30px;color: #ba0000\">You win 0 points!</p>";
            }
        },
    };

var s0_r1_low60 = {
        type: 'canvas-keyboard-response',
        on_start: function(s0_r1_low60){
            s0_r1_low60.index = index1
            s0_r1_low60.random_r1_70 = Math.floor(jsPsych.currentTrial().index * r1_70.length);
            s0_r1_low60.reward_r1_70 = r1_70_s[jsPsych.currentTrial().random_r1_70]
            s0_r1_low60.contrast1 = randbet(0.7,0.9);
            s0_r1_low60.contrast = randbet(0.1,0.3);
        },
        stimulus: gabor,
        data: {condition: 'LH', state: '0', reward: '1', prob: '70_30'},
        choices: keys, trial_duration: duration, response_ends_trial: false,
        on_finish: function (data) {
            if (data.key_press === jsPsych.currentTrial().reward_r1_70) {
                data.correct = true;
            } else if (data.key_press === null) {
                missed.push(1),
                missed_fb.push(jsPsych.currentTrial().reward_r1_70),
                missed_con.push(jsPsych.currentTrial().contrast),
                missed_con1.push(jsPsych.currentTrial().contrast1)
            }
            else {
                data.correct = false;
            }
            data.corr_resp = jsPsych.currentTrial().reward_r1_70
            data.con = jsPsych.currentTrial().contrast
            data.con1 = jsPsych.currentTrial().contrast1
            data.miss = missed.length
        },
    };

var s0_r1_hl60 = {timeline: [fix, s0_r1_low60, fb], repetitions: 1, randomize_order: false};

This is the trial that needs to be presented when the participant misses a trial.

var missed_trial = {
        type: 'canvas-keyboard-response',
        stimulus: gabor,
        data: {condition: 'missed', state: '1', reward: '2', prob: '30_70'},
        choices: keys, response_ends_trial: false, trial_duration: duration,
        on_start: function(missed_trial) {
            missed_trial.missed_reward = missed_fb.shift()
            missed_trial.contrast = missed_con.shift();
            missed_trial.contrast1 = missed_con1.shift();
        },
        on_finish: function (data) {
            if (data.key_press === jsPsych.currentTrial().missed_reward) {
                data.correct = true;
                missed.pop()
            } else if (data.key_press === null) {
                missed.push(1)
                missed_fb.push(jsPsych.currentTrial().missed_reward),
                missed_con.push(jsPsych.currentTrial().contrast),
                missed_con1.push(jsPsych.currentTrial().contrast1)
            }
            else {
                data.correct = false;
                missed.pop()
            }
            data.corr_resp = jsPsych.currentTrial().missed_reward
            data.con = jsPsych.currentTrial().contrast
            data.con1 = jsPsych.currentTrial().contrast1
            data.stim = missed.length
            t = t + 3
            data.tcount = t
        },
    }
    var missed_hl = {timeline: [fix, missed_trial, fb], repetitions: 1, randomize_order: false}

Then, I run a looping timeline to check the length of the list missed. If the length of the missed list is greater than 0, it returns true and runs the timeline called missed_hl.

var missed_loop = {
        timeline: [missed_hl],
        loop_function: function(data) {
            if (data.miss >= 1) {
                return true;
            } else if (data.miss <= 0) {
                return false;
            }
        },
    }

This works perfectly when the participant misses 1 or more trials and it repeats it at the end of the trial. However, the issue that I am facing is that when the participant does not miss any trial in a particular block, it presents the timeline missed_hl to the participant once and then ends the block. How can I fix it? Any inputs is highly appreciated.
Thank you,
Prashanti

[becky-gilbert]

Hi @prashantig25, is this the same question that you asked here? If so, just wanted to let you know that I replied on that thread (here).

[prashantig25]

Great, thanks so much @becky-gilbert!