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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
<!--
    Shawn T. Schwartz, 2023
    <stschwartz@stanford.edu>
-->
<!DOCTYPE html>
<html>
  <head>
    <title>Psych 45 | N-Back Tasks 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>
    <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>
        // task constants
        const STIMSET = ['Y', 'A', 'X', 'P', 'Q', 'E', 'N', 'M', 'T', 'W', 'U', 'S', 'B', 'R'];
        const TRIAL_TIME = 2000; // 2 s
        const ITI = 1500; // 1.5 s
        const KEYS = ['ArrowLeft', 'ArrowRight'];
        const NTRIALS = 20; // for each nback task (80 total)

        // init jsPsych
        var jsPsych = initJsPsych({
            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_";

        function make_nback_sequence(n_back, n_trials) {
            n_match = n_trials / 2;
            n_mismatch = n_trials - n_match;
            var is_match = [];

            for (var i = 0; i < n_match; i++) {
                is_match.push('match');
            }

            for (var i = 0; i < n_mismatch; i++) {
                is_match.push('mismatch');
            }

            is_match = jsPsych.randomization.shuffle(is_match);

            sequence = [];

            // adapted from: https://github.com/jspsych/tutorials/blob/master/n-back/index.html
            for (var i = 0; i < n_trials; i++) {
                if (sequence.length < n_back) {
                    var stim = jsPsych.randomization.sampleWithoutReplacement(STIMSET, 1)[0];
                } else {
                    if (is_match[i] == 'match') {
                        var stim = sequence[sequence.length - n_back];
                    } else {
                        var filler_stims = jsPsych.randomization.sampleWithoutReplacement(STIMSET, 2);
                        if (filler_stims[0] != sequence[sequence.length - n_back]) {
                            var stim = filler_stims[0];
                        } else {
                            var stim = filler_stims[1];
                        }
                    }
                }
                sequence.push(stim);
            }

            // now make these a dictionary containing the relevant trial level info
            seq_dict = [];

            for (var i = 0; i < sequence.length; i++) {
                if (i < n_back) {
                    var exclude_me = true;
                } else {
                    var exclude_me = false;
                }

                seq_dict.push({
                    stimulus: '<div style="font-size:100px;">' + sequence[i] + '</div>',
                    match_type: is_match[i],
                    exclude_trial: exclude_me,
                });
            }

            return seq_dict;
        }

        // generate nback sequences
        var oneback_stims_dict = make_nback_sequence(1, NTRIALS);
        var twoback_stims_dict = make_nback_sequence(2, NTRIALS);
        var threeback_stims_dict = make_nback_sequence(3, NTRIALS);
        var fourback_stims_dict = make_nback_sequence(4, NTRIALS);

        // make fixation cross
        var fixation = {
            type: jsPsychHtmlKeyboardResponse,
            stimulus: '<div style="font-size:100px;">+</div>',
            choices: "NO_KEYS",
            trial_duration: ITI,
            data: {
                phase: 'fixation'
            }
        };

        // define nback stim trial
        var nback = {
            type: jsPsychHtmlKeyboardResponse,
            stimulus: jsPsych.timelineVariable('stimulus'),
            choices: KEYS,
            trial_duration: TRIAL_TIME,
            response_ends_trial: false,
            on_finish: function(data) {
                // label arrow key response for ease of data analysis
                if (jsPsych.pluginAPI.compareKeys(data.response, "ArrowLeft")) {
                    data.response_type = "match"
                } else if (jsPsych.pluginAPI.compareKeys(data.response, "ArrowRight")) {
                    data.response_type = "mismatch"
                } else {
                    data.response_type = "NO_RESPONSE"
                }

                // score the trial as correct or incorrect
                if (jsPsych.pluginAPI.compareKeys(data.response_type, data.match_type)) {
                    data.correct = true;
                } else {
                    data.correct = false;
                }
            }
        };

        // define nback procedure blocks
        var one_back_procedure = {
            timeline: [fixation, nback],
            timeline_variables: oneback_stims_dict,
            randomize_order: false,
            data: {
                phase: '1back',
                match_type: jsPsych.timelineVariable('match_type'),
                exclude_trial: jsPsych.timelineVariable('exclude_trial')
            },
        };

        var two_back_procedure = {
            timeline: [fixation, nback],
            timeline_variables: twoback_stims_dict,
            randomize_order: false,
            data: {
                phase: '2back',
                match_type: jsPsych.timelineVariable('match_type'),
                exclude_trial: jsPsych.timelineVariable('exclude_trial')
            },
        };

        var three_back_procedure = {
            timeline: [fixation, nback],
            timeline_variables: threeback_stims_dict,
            randomize_order: false,
            data: {
                phase: '3back',
                match_type: jsPsych.timelineVariable('match_type'),
                exclude_trial: jsPsych.timelineVariable('exclude_trial')
            },
        };

        var four_back_procedure = {
            timeline: [fixation, nback],
            timeline_variables: fourback_stims_dict,
            randomize_order: false,
            data: {
                phase: '4back',
                match_type: jsPsych.timelineVariable('match_type'),
                exclude_trial: jsPsych.timelineVariable('exclude_trial')
            },
        };

        // 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: 'c',
            post_trial_gap: 1000,
            stimulus: '<strong>Welcome to Part 1 of the Working Memory 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">C</strong> key 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 n_back_instructions = {
            type: jsPsychHtmlKeyboardResponse,
            choices: 'c',
            post_trial_gap: 1000,
            stimulus: 'You will first complete a series of "N-Back" working memory tasks. <br /><br /> Here, you will see a series of letters presented one-at-a-time at the center of the screen. <br /><br />Your task will be to make a response on your keyboard as to whether or not the current letter on the screen matches that from <strong>N</strong> trials ago. <br /><br />For demonstration purposes, we will have you complete one of each: 1-back, 2-back, 3-back, and 4-back so you can get a sense of how each works. <br /><br />Importantly, we will tell you which version you will be completing before you get started. <br /><br />Press the <strong class="upperline">C</strong> key on your keyboard to begin.'
        }
        timeline.push(n_back_instructions);

        var one_back_instructions = {
            type: jsPsychHtmlKeyboardResponse,
            choices: ' ',
            post_trial_gap: 1000,
            stimulus: '<center><strong><u>1-Back task:</u></strong></center> <br />Here, you will indicate whether the current letter on the screen matches that of the letter that came just <strong>1 position</strong> before it (for the first letter of this trial, please make no response as no letter will have come before it). <br /><br />While the letter is on the screen, please press your <strong>left-arrow key</strong> to indicate that the current letter <u>matches</u>, or the <strong>right-arrow key</strong> to indicate that it <u>does not match</u>. <br /><br />Press the <strong class="upperline">SPACEBAR</strong> key on your keyboard to officially begin the 1-back task.'
        }
        timeline.push(one_back_instructions);
        timeline.push(one_back_procedure);

        var two_back_instructions = {
            type: jsPsychHtmlKeyboardResponse,
            choices: ' ',
            post_trial_gap: 1000,
            stimulus: '<center><strong><u>2-Back task:</u></strong></center> <br />Here, you will indicate whether the current letter on the screen matches that of the letter that came <strong>2 positions</strong> before it (for the first two letters of this trial, please make no response as no letter will have come 2 positions before them). <br /><br />While the letter is on the screen, please press your <strong>left-arrow key</strong> to indicate that the current letter <u>matches</u>, or the <strong>right-arrow key</strong> to indicate that it <u>does not match</u>. <br /><br />Press the <strong class="upperline">SPACEBAR</strong> key on your keyboard to officially begin the 2-back task.'
        }
        timeline.push(two_back_instructions);
        timeline.push(two_back_procedure);

        var three_back_instructions = {
            type: jsPsychHtmlKeyboardResponse,
            choices: ' ',
            post_trial_gap: 1000,
            stimulus: '<center><strong><u>3-Back task:</u></strong></center> <br />Here, you will indicate whether the current letter on the screen matches that of the letter that came <strong>3 positions</strong> before it (for the first three letters of this trial, please make no response as no letter will have come 3 positions before them). <br /><br />While the letter is on the screen, please press your <strong>left-arrow key</strong> to indicate that the current letter <u>matches</u>, or the <strong>right-arrow key</strong> to indicate that it <u>does not match</u>. <br /><br />Press the <strong class="upperline">SPACEBAR</strong> key on your keyboard to officially begin the 3-back task.'
        }
        timeline.push(three_back_instructions);
        timeline.push(three_back_procedure);

        var four_back_instructions = {
            type: jsPsychHtmlKeyboardResponse,
            choices: ' ',
            post_trial_gap: 1000,
            stimulus: '<center><strong><u>4-Back task:</u></strong></center> <br />Here, you will indicate whether the current letter on the screen matches that of the letter that came <strong>4 positions</strong> before it (for the first four letters of this trial, please make no response as no letter will have come 4 positions before them). <br /><br />While the letter is on the screen, please press your <strong>left-arrow key</strong> to indicate that the current letter <u>matches</u>, or the <strong>right-arrow key</strong> to indicate that it <u>does not match</u>. <br /><br />Press the <strong class="upperline">SPACEBAR</strong> key on your keyboard to officially begin the 4-back task.'
        }
        timeline.push(four_back_instructions);
        timeline.push(four_back_procedure);

        var download_data = {
            type: jsPsychHtmlKeyboardResponse,
            choices: 'd',
            post_trial_gap: 1000,
            stimulus: '<br /><br /><center>Thank you for completing the N-Back 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 />Now, please continue on to the second part of this Working Memory MiA: <a href='sternberg.html' target='_blank'>the Sternberg Working Memory Task</a>. 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>