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HTML
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CSS
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JS 

              
                // This file demonstrates how to present two images with 1000-ms SOA

const images = [
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/1.gif',
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/2.gif',
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/3.gif',
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/4.gif',
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/5.gif',
  'https://cdn.jsdelivr.net/gh/jspsych/jsPsych@6.3.1/examples/img/6.gif'
]

    const jsPsych = initJsPsych({
        on_finish: function() {
            jsPsych.data.displayData();
        }
    })
    console.log(`jsPsych Version ${jsPsych.version()}`)

    const pixi_flag = jsPsych.data.getURLVariable('pixi_flag') === '1' ? true : false;

    const instruction = {
        type: jsPsychHtmlButtonResponse,
        stimulus: 'Click on the Start button.',
        choices: ['Start'],
        prompt: "This is a sample program for the jspsych-psychophysics plugin.",
    }

    // Preloading files are needed to present the stimuli accurately.
    const preload = {
        type: jsPsychPreload,
        images: images,
    }

    const trial = {
        timeline: [
            {
                type: jsPsychPsychophysics,
                pixi: pixi_flag,
                stimuli: [
                    {
                        obj_type: 'image',
                        file: jsPsych.timelineVariable('firstImage'),
                        show_start_frame: 0, // frames after the start of the trial
                        show_end_frame: 5,
                        is_frame: true, // required
                        startX: 300,
                    },
                    {
                        obj_type: 'image',
                        file: jsPsych.timelineVariable('secondImage'),
                        show_start_frame: 60, // frames after the start of the trial
                        show_end_frame: 80,
                        is_frame: true, // required
                        startX: 600
                    }
                ],
                canvas_height: 500,
                prompt: 'Press any key to proceed.',
                data: {'firstImage': jsPsych.timelineVariable('firstImage'),
                'secondImage': jsPsych.timelineVariable('secondImage')} // for identification
            }
        ],
        timeline_variables: [
            {firstImage: images[0], secondImage: images[1]},
            {firstImage: images[2], secondImage: images[3]},
            {firstImage: images[4], secondImage: images[5]}
        ],
        randomize_order: true
    }

    jsPsych.run([preload, instruction, trial])
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