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demo.html
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demo.html
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<!DOCTYPE html>
<html>
<head>
<title>My experiment</title>
<script src="https://unpkg.com/jspsych@7.3.4"></script>
<script src="https://unpkg.com/@jspsych/plugin-html-keyboard-response@1.1.3"></script>
<script src="https://unpkg.com/@jspsych/plugin-image-keyboard-response@1.1.3"></script>
<script src="https://unpkg.com/@jspsych/plugin-preload@1.1.3"></script>
<link href="https://unpkg.com/jspsych@7.3.4/css/jspsych.css" rel="stylesheet" type="text/css" />
</head>
<body></body>
<script>
const jsPsych = initJsPsych({
on_finish: function() {
jsPsych.data.displayData(); // for debugging
}
});
let timeline = [];
const preload = {
type: jsPsychPreload,
images: ['img/blue.png', 'img/orange.png']
};
timeline.push(preload);
const welcome = {
type: jsPsychHtmlKeyboardResponse,
stimulus: "Welcome to the experiment. Press any key to begin."
};
timeline.push(welcome);
const instructions = {
type: jsPsychHtmlKeyboardResponse,
stimulus: `
<p>In this experiment, a circle will appear in the center
of the screen.</p><p>If the circle is <strong>blue</strong>,
press the letter F on the keyboard as fast as you can.</p>
<p>If the circle is <strong>orange</strong>, press the letter J
as fast as you can.</p>
<div style='width: 700px;'>
<div style='float: left;'><img src='img/blue.png'></img>
<p class='small'><strong>Press the F key</strong></p></div>
<div style='float: right;'><img src='img/orange.png'></img>
<p class='small'><strong>Press the J key</strong></p></div>
</div>
<p>Press any key to begin.</p>
`,
post_trial_gap: 2000
};
timeline.push(instructions);
// const blue_trial = {
// type: jsPsychImageKeyboardResponse,
// stimulus: 'img/blue.png',
// choices: ['f', 'j']
// };
// const orange_trial = {
// type: jsPsychImageKeyboardResponse,
// stimulus: 'img/orange.png',
// choices: ['f', 'j']
// };
// timeline.push(blue_trial, orange_trial);
const test_stimuli = [
{ stimulus: "img/blue.png", correct_response: 'f' },
{ stimulus: "img/orange.png", correct_response: 'j' }
];
const fixation = {
type: jsPsychHtmlKeyboardResponse,
stimulus: '<div style="font-size:60px;">+</div>',
choices: "NO_KEYS",
trial_duration: function(){
return jsPsych.randomization.sampleWithoutReplacement([250, 500, 750, 1000, 1250, 1500, 1750, 2000], 1)[0]; // need [0] because return value is an array
},
data: {
task: 'fixation'
}
};
const test = {
type: jsPsychImageKeyboardResponse,
stimulus: jsPsych.timelineVariable('stimulus'),
choices: ['f', 'j'],
data: {
task: 'response',
correct_response: jsPsych.timelineVariable('correct_response')
},
on_finish: function(data){
data.correct = jsPsych.pluginAPI.compareKeys(data.response, data.correct_response);
}
}
const test_procedure = {
timeline: [fixation, test],
timeline_variables: test_stimuli,
randomize_order: true, // randomize the order of the stimuli
repetitions: 5 // repeat each stimulus
}
timeline.push(test_procedure);
const debrief_block = {
type: jsPsychHtmlKeyboardResponse,
stimulus: function() {
var trials = jsPsych.data.get().filter({task: 'response'});
var correct_trials = trials.filter({correct: true});
var accuracy = Math.round(correct_trials.count() / trials.count() * 100);
var rt = Math.round(correct_trials.select('rt').mean());
return `<p>You responded correctly on ${accuracy}% of the trials.</p>
<p>Your average response time was ${rt}ms.</p>
<p>Press any key to complete the experiment. Thank you!</p>`;
}
};
timeline.push(debrief_block);
jsPsych.run(timeline);
</script>
</html>