psych45-demos/eb.html at spring25 · WagnerLab/psych45-demos · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>Psych 45 | Event Boundaries Demo</title>
    <script src="https://unpkg.com/jspsych@7.3.2"></script>
    <script src="https://unpkg.com/@jspsych/plugin-html-keyboard-response@1.1.2"></script>
    <script src="https://unpkg.com/@jspsych/plugin-fullscreen@1.1.0"></script>
    <script src="https://unpkg.com/@jspsych/plugin-browser-check@1.0.0"></script>
    <script src="https://unpkg.com/@jspsych/plugin-video-keyboard-response@1.0.0"></script>
    <link href="https://unpkg.com/jspsych@7.3.2/css/jspsych.css" rel="stylesheet" type="text/css" />
    <style>
        .upperline {
            text-transform: uppercase;
            text-decoration: underline;
        }
    </style>
  </head>
  <body></body>
  <script>
        // init jsPsych
        var jsPsych = initJsPsych({
            override_safe_mode: true,
            on_finish: function() {
                // get current time
                var timestamp = Date.now();

                // gather and save all data locally
                var all_data = jsPsych.data.get();
                all_data.localSave('csv', file_pattern_data + "_" + timestamp + ".csv");
            }
        });

        // make random subject id
        var subject_id = jsPsych.randomization.randomID(15);
        var study_id = 'nback'

        // append study metadata to output data
        jsPsych.data.addProperties({
            subject_id: subject_id,
            study_id: study_id
        });

        // make filename pattern
        var file_pattern_data = subject_id + "_" + study_id + "_data_";

        var response_times = [];
        var startTime = 0;

        // Function to handle space bar press
        function handleSpaceBarPress(event) {
          if (event.key === " " || event.keyCode === 32) {
            response_times.push(jsPsych.getTotalTime() - startTime);
          }
        }

        var record_button_presses = function() {
            // Add event listener for keydown event
            document.addEventListener("keydown", handleSpaceBarPress);
        }

        var video_trial = {
          type: jsPsychVideoKeyboardResponse,
          stimulus: [
            'src/media/gardening_25fps.mp4'
          ],
          choices: "NO_KEYS",
          response_ends_trial: false,
          trial_ends_after_video: true
        };

        var video_trial_with_rsp = {
          type: jsPsychVideoKeyboardResponse,
          stimulus: [
            'src/media/gardening_25fps.mp4'
          ],
          choices: [" "],
          response_ends_trial: false,
          trial_ends_after_video: true,
          on_load: function() {
            startTime = jsPsych.getTotalTime();
            record_button_presses();
          },
          on_finish: function(data){
            data.response_times = response_times;
          }
        };

        // create timeline
        var timeline = [];

        // force browser into full screen mode
        var enter_fullscreen = {
            type: jsPsychFullscreen,
            fullscreen_mode: true
        };
        timeline.push(enter_fullscreen);

        // welcome message
        var welcome = {
            type: jsPsychHtmlKeyboardResponse,
            choices: ' ',
            post_trial_gap: 500,
            stimulus: '<strong>Welcome to the Event Boundaries MiA for Psych 45!</strong> <br /><br />This demo experiment will take about 10 minutes to complete. Please complete all in one sitting. <br /><br />For this study, <strong>please use</strong> a laptop or desktop computer (not a mobile phone or tablet). Also, please use either <u>Chrome or Firefox</u>. <br /><br />Once you begin, <strong>DO NOT</strong> refresh the browser, as the study will reset and you will lose your progress. <br /><br />Press the <strong class="upperline">spacebar</strong> on your keyboard to move onto the instructions. <br /><br /><u>(if you encounter any technical difficulties, please contact TA Shawn Schwartz: <a href="mailto:stschwartz@stanford.edu?Subject=[Psych45]:%20MiA%20Task%20Demo%20Issue" target="_blank">stschwartz [at] stanford [dot] edu</a>)</u>'
        };
        timeline.push(welcome);

        // check browser and ensure user is not on mobile device
        var check_browser_and_device = {
            type: jsPsychBrowserCheck,
            inclusion_function: (data) => {
                return (data.browser == 'chrome' || data.browser == 'firefox') && data.mobile === false
            },
            exclusion_message: () => {
                if (data.mobile) {
                    return '<p>You must use a desktop/laptop computer to participate in this experiment.</p>';
                } else if (data.browser !== 'chrome' || data.browser !== 'firefox') {
                    return '<p>You must use either Chrome or Firefox as your browser to complete this experiment.</p>';
                }
            }
        };
        timeline.push(check_browser_and_device);

        // check browser window size
        var check_window_size = {
            type: jsPsychBrowserCheck,
            minimum_width: 1000,
            minimum_height: 600
        };
        timeline.push(check_window_size);

        // instructions
        var instructions_1 = {
            type: jsPsychHtmlKeyboardResponse,
            choices: 'b',
            post_trial_gap: 500,
            stimulus: 'In this study, you will watch a 5 minute video twice. During the first viewing, you will simply be asked to watch the video and <strong>will not be asked</strong> to make any responses.<br /><br />During the second viewing, <strong>your goal will be to identify whenever one meaningful unit of activity ends and another begins</strong>; you will press the <strong class="upperline">SPACEBAR</strong> to mark these boundaries.<br /><br />Now, press the <strong class="upperline">b</strong> on your keyboard to start the video. Again, during this first part of the study, please <strong>do NOT</strong> make any responses.'
        }

        timeline.push(instructions_1);

        var instructions_2 = {
            type: jsPsychHtmlKeyboardResponse,
            choices: 'b',
            post_trial_gap: 500,
            stimulus: '<br />Now that you have familiarized yourself with the video, we will ask you to watch it once more. Again, <strong>your goal is to identify whenever one meaningful unit of activity ends and another begins</strong>; importantly, press the <strong class="upperline">spacebar</strong> to mark these boundaries <strong>while watching the video</strong>.<br /><br />Now, press the <strong class="upperline">b</strong> key on your keyboard to begin.'
        }
        timeline.push(video_trial);
        timeline.push(instructions_2);
        timeline.push(video_trial_with_rsp);

        var download_data = {
            type: jsPsychHtmlKeyboardResponse,
            choices: 'd',
            post_trial_gap: 1000,
            stimulus: '<br /><br /><center>Thank you for completing the Event Boundary demo study. <br /><br /><strong><u>IMPORTANTLY:</u></strong> Please press the <strong class="upperline">d</strong> key on your keyboard to <strong>download your data file</strong>. <br /><br />Please submit this data file that was just downloaded to your computer via the instructions on Canvas.</center>',
            on_finish: function() {
                setTimeout(function() {
                    document.querySelector('body').innerHTML = "<br /><br /><center><strong>Data successfully downloaded!</strong><br /><br />Thank you!</center>";
                }, 750);
            }
        }
        timeline.push(download_data);

        // exit full screen mode
        var exit_fullscreen = {
            type: jsPsychFullscreen,
            fullscreen_mode: false,
            delay_after: 0
        };
        timeline.push(exit_fullscreen);

        // execute experiment
        jsPsych.run(timeline);
  </script>
</html>