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

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Demo Experiment: Simple Reaction Time Task
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Video Tutorials
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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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Plugins
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<a href="../list-of-plugins/" class="md-nav__link">
List of Plugins
</a>
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<li class="md-nav__item">
<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>
<li class="md-nav__item">
<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
</a>
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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
</a>
</li>
<li class="md-nav__item">
<a href="../html-button-response/" class="md-nav__link">
html-button-response
</a>
</li>
<li class="md-nav__item">
<a href="../html-keyboard-response/" class="md-nav__link">
html-keyboard-response
</a>
</li>
<li class="md-nav__item">
<a href="../html-slider-response/" class="md-nav__link">
html-slider-response
</a>
</li>
<li class="md-nav__item">
<a href="../iat-html/" class="md-nav__link">
iat-html
</a>
</li>
<li class="md-nav__item">
<a href="../iat-image/" class="md-nav__link">
iat-image
</a>
</li>
<li class="md-nav__item">
<a href="../image-button-response/" class="md-nav__link">
image-button-response
</a>
</li>
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image-keyboard-response
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<a href="./" class="md-nav__link md-nav__link--active">
image-keyboard-response
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Table of contents
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<a href="#parameters" class="md-nav__link">
Parameters
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Data Generated
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Examples
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image-slider-response
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instructions
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maxdiff
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<a href="../preload/" class="md-nav__link">
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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<a href="../video-keyboard-response/" class="md-nav__link">
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/image-keyboard-response.md" title="Edit this page" class="md-content__button md-icon">
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<h1 id="image-keyboard-response">image-keyboard-response<a class="headerlink" href="#image-keyboard-response" title="Permanent link">&para;</a></h1>
<p>This plugin displays and image 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>
<p>Image files can be automatically preloaded by jsPsych using the <a href="../preload/"><code>preload</code> plugin</a>. However, if you are using timeline variables or another dynamic method to specify the image stimulus, you will need to <a href="../../overview/media-preloading/#manual-preloading">manually preload</a> the images.</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>string</td>
<td><em>undefined</em></td>
<td>The path of the image file to be displayed.</td>
</tr>
<tr>
<td>stimulus_height</td>
<td>integer</td>
<td>null</td>
<td>Set the height of the image in pixels. If left null (no value specified), then the image will display at its natural height.</td>
</tr>
<tr>
<td>stimulus_width</td>
<td>integer</td>
<td>null</td>
<td>Set the width of the image in pixels. If left null (no value specified), then the image will display at its natural width.</td>
</tr>
<tr>
<td>maintain_aspect_ratio</td>
<td>boolean</td>
<td>true</td>
<td>If setting <em>only</em> the width or <em>only</em> the height and this parameter is true, then the other dimension will be scaled to maintain the image's aspect ratio.</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 show the stimulus for in milliseconds. If the value is <code>null</code>, then the stimulus will be shown until the subject makes a response.</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 <code>null</code>, 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>
<tr>
<td>render_on_canvas</td>
<td>boolean</td>
<td>true</td>
<td>If <code>true</code>, the image will be drawn onto a canvas element. This prevents a blank screen (white flash) between consecutive image trials in some browsers, like Firefox and Edge. If <code>false</code>, the image will be shown via an img element, as in previous versions of jsPsych. If the stimulus is an <strong>animated gif</strong>, you must set this parameter to false, because the canvas rendering method will only present static images.</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 path of the image that was displayed.</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">jsPsychImageKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s1">&#39;img/happy_face_1.png&#39;</span><span class="p">,</span>
<span class="nx">choices</span><span class="o">:</span> <span class="p">[</span><span class="s1">&#39;e&#39;</span><span class="p">,</span> <span class="s1">&#39;i&#39;</span><span class="p">],</span>
<span class="nx">prompt</span><span class="o">:</span> <span class="s2">&quot;&lt;p&gt;Is this person happy or sad? Press &#39;e&#39; for happy and &#39;i&#39; for sad.&lt;/p&gt;&quot;</span><span class="p">,</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-image-keyboard-response-demo1.html" width="90%;" height="600px;" frameBorder="0"></iframe>
</div></p>
</div>
</div>
<p><a target="_blank" rel="noopener noreferrer" href="../../demos/jspsych-image-keyboard-response-demo1.html">Open demo in new tab</a></p>
</details>
<details class="example" open="open"><summary>Displaying image for a fixed duration; 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">jsPsychImageKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s1">&#39;img/happy_face_1.png&#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">prompt</span><span class="o">:</span> <span class="s2">&quot;&lt;p&gt;Study this face for 5 seconds.&lt;/p&gt;&quot;</span><span class="p">,</span>
<span class="nx">trial_duration</span><span class="o">:</span> <span class="mf">5000</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-image-keyboard-response-demo2.html" width="90%;" height="600px;" frameBorder="0"></iframe>
</div></p>
</div>
</div>
<p><a target="_blank" rel="noopener noreferrer" href="../../demos/jspsych-image-keyboard-response-demo2.html">Open demo in new tab</a></p>
</details>
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