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jsPsych/7.0/plugins/html-keyboard-response/index.html

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The Basics: Hello World
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Demo Experiment: Simple Reaction Time Task
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Video Tutorials
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Record Browser Interactions
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Media Preloading
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Fullscreen Experiments
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Eye Tracking
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Exclude Participants Based on Browser Features
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Automatic Progress Bar
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Integrating with Prolific
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Integrating with Mechanical Turk
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Browser and Device Support
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Timing Accuracy
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<a href="../../reference/jspsych/" class="md-nav__link">
jsPsych
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jsPsych.data
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jsPsych.randomization
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jsPsych.turk
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jsPsych.pluginAPI
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List of Plugins
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<a href="../animation/" class="md-nav__link">
animation
</a>
</li>
<li class="md-nav__item">
<a href="../audio-button-response/" class="md-nav__link">
audio-button-response
</a>
</li>
<li class="md-nav__item">
<a href="../audio-keyboard-response/" class="md-nav__link">
audio-keyboard-response
</a>
</li>
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<a href="../audio-slider-response/" class="md-nav__link">
audio-slider-response
</a>
</li>
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<a href="../call-function/" class="md-nav__link">
call-function
</a>
</li>
<li class="md-nav__item">
<a href="../canvas-button-response/" class="md-nav__link">
canvas-button-response
</a>
</li>
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<a href="../canvas-keyboard-response/" class="md-nav__link">
canvas-keyboard-response
</a>
</li>
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canvas-slider-response
</a>
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categorize-animation
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categorize-html
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categorize-image
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cloze
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external-html
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free-sort
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fullscreen
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</li>
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<a href="../html-button-response/" class="md-nav__link">
html-button-response
</a>
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html-keyboard-response
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html-keyboard-response
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Table of contents
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<li class="md-nav__item">
<a href="#parameters" class="md-nav__link">
Parameters
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<a href="#data-generated" class="md-nav__link">
Data Generated
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Examples
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html-slider-response
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<a href="../iat-html/" class="md-nav__link">
iat-html
</a>
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<a href="../iat-image/" class="md-nav__link">
iat-image
</a>
</li>
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<a href="../image-button-response/" class="md-nav__link">
image-button-response
</a>
</li>
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<a href="../image-keyboard-response/" class="md-nav__link">
image-keyboard-response
</a>
</li>
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image-slider-response
</a>
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instructions
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maxdiff
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preload
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reconstruction
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resize
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same-different-html
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same-different-image
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serial-reaction-time
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serial-reaction-time-mouse
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survey-html-form
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survey-likert
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survey-multi-choice
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survey-multi-select
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survey-text
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video-button-response
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video-keyboard-response
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video-slider-response
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virtual-chinrest
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visual-search-circle
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webgazer-calibrate
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webgazer-init-camera
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webgazer-validate
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<article class="md-content__inner md-typeset">
<a href="https://github.com/jspsych/jsPsych/edit/master/docs/plugins/html-keyboard-response.md" title="Edit this page" class="md-content__button md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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<h1 id="html-keyboard-response">html-keyboard-response<a class="headerlink" href="#html-keyboard-response" title="Permanent link">&para;</a></h1>
<p>This plugin displays HTML content and records responses generated with the keyboard.The stimulus can be displayed until a response is given, or for a pre-determined amount of time. The trial can be ended automatically if the subject has failed to respond within a fixed length of time.</p>
<h2 id="parameters">Parameters<a class="headerlink" href="#parameters" title="Permanent link">&para;</a></h2>
<p>In addition to the <a href="../../overview/plugins/#parameters-available-in-all-plugins">parameters available in all plugins</a>, this plugin accepts the following parameters. Parameters with a default value of undefined must be specified. Other parameters can be left unspecified if the default value is acceptable.</p>
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Type</th>
<th>Default Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>stimulus</td>
<td>HTML string</td>
<td><em>undefined</em></td>
<td>The string to be displayed.</td>
</tr>
<tr>
<td>choices</td>
<td>array of strings</td>
<td><code>jsPsych.ALL_KEYS</code></td>
<td>This array contains the key(s) that the subject is allowed to press in order to respond to the stimulus. Keys should be specified as characters (e.g., <code>'a'</code>, <code>'q'</code>, <code>' '</code>, <code>'Enter'</code>, <code>'ArrowDown'</code>) - see <a href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values">this page</a> and <a href="https://www.freecodecamp.org/news/javascript-keycode-list-keypress-event-key-codes/">this page (event.key column)</a> for more examples. Any key presses that are not listed in the array will be ignored. The default value of <code>jsPsych.ALL_KEYS</code> means that all keys will be accepted as valid responses. Specifying <code>jsPsych.NO_KEYS</code> will mean that no responses are allowed.</td>
</tr>
<tr>
<td>prompt</td>
<td>string</td>
<td>null</td>
<td>This string can contain HTML markup. Any content here will be displayed below the stimulus. The intention is that it can be used to provide a reminder about the action the subject is supposed to take (e.g., which key to press).</td>
</tr>
<tr>
<td>stimulus_duration</td>
<td>numeric</td>
<td>null</td>
<td>How long to display the stimulus in milliseconds. The visibility CSS property of the stimulus will be set to <code>hidden</code> after this time has elapsed. If this is null, then the stimulus will remain visible until the trial ends.</td>
</tr>
<tr>
<td>trial_duration</td>
<td>numeric</td>
<td>null</td>
<td>How long to wait for the subject to make a response before ending the trial in milliseconds. If the subject fails to make a response before this timer is reached, the subject's response will be recorded as null for the trial and the trial will end. If the value of this parameter is null, then the trial will wait for a response indefinitely.</td>
</tr>
<tr>
<td>response_ends_trial</td>
<td>boolean</td>
<td>true</td>
<td>If true, then the trial will end whenever the subject makes a response (assuming they make their response before the cutoff specified by the <code>trial_duration</code> parameter). If false, then the trial will continue until the value for <code>trial_duration</code> is reached. You can set this parameter to <code>false</code> to force the subject to view a stimulus for a fixed amount of time, even if they respond before the time is complete.</td>
</tr>
</tbody>
</table>
<h2 id="data-generated">Data Generated<a class="headerlink" href="#data-generated" title="Permanent link">&para;</a></h2>
<p>In addition to the <a href="../../overview/plugins/#data-collected-by-all-plugins">default data collected by all plugins</a>, this plugin collects the following data for each trial.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>response</td>
<td>string</td>
<td>Indicates which key the subject pressed.</td>
</tr>
<tr>
<td>rt</td>
<td>numeric</td>
<td>The response time in milliseconds for the subject to make a response. The time is measured from when the stimulus first appears on the screen until the subject's response.</td>
</tr>
<tr>
<td>stimulus</td>
<td>string</td>
<td>The HTML content that was displayed on the screen.</td>
</tr>
</tbody>
</table>
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permanent link">&para;</a></h2>
<details class="example" open="open"><summary>Displaying trial until subject gives a response</summary><div class="tabbed-set" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><label for="__tabbed_1_1">Code</label><div class="tabbed-content">
<div class="highlight"><pre><span></span><code><span class="kd">var</span> <span class="nx">trial</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">type</span><span class="o">:</span> <span class="nx">jsPsychHtmlKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s1">&#39;&lt;p style=&quot;font-size:48px; color:green;&quot;&gt;BLUE&lt;/p&gt;&#39;</span><span class="p">,</span>
<span class="nx">choices</span><span class="o">:</span> <span class="p">[</span><span class="s1">&#39;r&#39;</span><span class="p">,</span> <span class="s1">&#39;g&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">],</span>
<span class="nx">prompt</span><span class="o">:</span> <span class="s2">&quot;&lt;p&gt;Is the ink color (r)ed, (g)reen, or (b)lue?&lt;/p&gt;&quot;</span>
<span class="p">};</span>
</code></pre></div>
</div>
<input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><label for="__tabbed_1_2">Demo</label><div class="tabbed-content">
<p><div style="text-align:center;">
<iframe src="../../demos/jspsych-html-keyboard-response-demo1.html" width="90%;" height="500px;" frameBorder="0"></iframe>
</div></p>
</div>
</div>
<p><a target="_blank" rel="noopener noreferrer" href="../../demos/jspsych-html-keyboard-response-demo1.html">Open demo in new tab</a></p>
</details>
<details class="example" open="open"><summary>Showing a 1 second fixation cross; no response allowed</summary><div class="tabbed-set" data-tabs="2:2"><input checked="checked" id="__tabbed_2_1" name="__tabbed_2" type="radio" /><label for="__tabbed_2_1">Code</label><div class="tabbed-content">
<div class="highlight"><pre><span></span><code><span class="kd">var</span> <span class="nx">trial</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">type</span><span class="o">:</span> <span class="nx">jsPsychHtmlKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s1">&#39;&lt;p style=&quot;font-size: 48px;&quot;&gt;+&lt;/p&gt;&#39;</span><span class="p">,</span>
<span class="nx">choices</span><span class="o">:</span> <span class="nx">jsPsych</span><span class="p">.</span><span class="nx">NO_KEYS</span><span class="p">,</span>
<span class="nx">trial_duration</span><span class="o">:</span> <span class="mf">1000</span><span class="p">,</span>
<span class="p">};</span>
</code></pre></div>
</div>
<input id="__tabbed_2_2" name="__tabbed_2" type="radio" /><label for="__tabbed_2_2">Demo</label><div class="tabbed-content">
<p><div style="text-align:center;">
<iframe src="../../demos/jspsych-html-keyboard-response-demo2.html" width="90%;" height="500px;" frameBorder="0"></iframe>
</div></p>
</div>
</div>
<p><a target="_blank" rel="noopener noreferrer" href="../../demos/jspsych-html-keyboard-response-demo2.html">Open demo in new tab</a></p>
</details>
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