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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>BCS 152 Tutorial</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="tutorial.css">
</head>
<body class="bckgrnd">
<nav id="nav" class="navbar navbar-default navbar-fixed-top"></nav>
<div>
<div class="jumbotron spr top">
<h1>Self Paced Reading Example: Critical Items</h1>
<p> Recall the 2x2 example design we described earlier:</p>
<figure>
<img title="Example 2x2 Design" alt="Example 2x2 Design" src="Example.png">
<figcaption style="text-align:center;">Figure 1: A 2x2 design, crossing contextual predictability (high vs. low) with word frequency (high vs. low).</figcaption>
</figure>
<br>
<p>
In this design, a critical item consists of four stimuli, one for each of our conditions.
</p>
<ul>
<li>I saw the apple on the table.</li>
<li>I saw the kiwi on the table.</li>
<li>I ate the apple on the table.</li>
<li>I ate the kiwi on the table.</li>
</ul>
<p>
We refer to the entire quadruple above as <em>one</em> critical item.
So, for a typical experiment we will have to make many such critical
items. Typically, self-paced reading experiments contains 6-8 times
as many critical items as they contain conditions. Why do you think
this is the case? Think about it for a moment and then quiz yourself.
</p>
</div>
<div class="jumbotron">
<div class="container">
<div class="row">
<table>
<tr>
<td class="col-md-12"><div><a class="btn btn-warning" href="SPRProcedure.html">←SPR: Procedure</a></div></td>
<td class="col-md-12"><div><a class="btn btn-warning" href="SPRRegion.html">SPR Example: Defining Sentence Regions →</a></div></td>
</tr>
</table>
</div>
</div>
</div>
<div class="jumbotron"> <button type="button" class="btn btn-block btn-lg btn-danger"
data-toggle="collapse"
data-target="#demo">Test Your Understanding</button>
<div id="demo" class="collapse">
<p class="question">1. Why do you think the recommended number of
critical items is function of the number of conditions? </p>
<ul class="answers">
<li><input name="q1" value="a" id="q1a" type="radio"><label for="q1a">Because the
number of conditions determines how motivated our participants will be.</label></li>
<li><input name="q1" value="b" id="q1b" type="radio"><label for="q1b"><!--CORRECT)--> Because more conditions means that, for the same number of items, we
will have fewer observation per condition.</label></li>
<li><input name="q1" value="c" id="q1c" type="radio"><label for="q1c"> More critical items mean more
statistical power.
</label></li>
</ul>
<p class="question">2. How many critical items should our example experiment have?</p>
<ul class="answers">
<li><input name="q2" value="a" id="q2a" type="radio"><label for="q2a">18-24
</label></li>
<li><input name="q2" value="b" id="q2b" type="radio"><label for="q2b"><!--CORRECT)--> 24-32
</label></li>
<li><input name="q2" value="c" id="q2c" type="radio"><label for="q2c">32-40
</label></li>
<li><input name="q2" value="d" id="q2d" type="radio"><label for="q2d">More than 40
</label></li>
</ul>
<p class="question">3. Can you think of a reason why it might be better to have 8 times as many items as conditions,
rather than 6 times as many items as conditions?</p>
<ul class="answers">
<li><input name="q3" value="a" id="q3a" type="radio"><label for="q3a">Participants can enjoy the experiment for a longer time.
</label></li>
<li><input name="q3" value="b" id="q3b" type="radio"><label for="q3b">We will need fewer filler items.
</label></li>
<li><input name="q3" value="c" id="q3c" type="radio"><label for="q3c"><!--CORRECT)--> More items means more statistical power to detect an effect.
</label></li>
<li><input name="q3" value="d" id="q3d" type="radio"><label for="q3d">More than 40
</label></li>
</ul>
<p class="question">4. Can you think of a reason why it might be better to have 6 times as many items as conditions,
rather than 8 times as many items as conditions?</p>
<ul class="answers">
<li><input name="q4" value="a" id="q4a" type="radio"><label for="q4a"><!--CORRECT)--> More items usually
mean that a participant will see more stimuli. The longer our experiment
will get, the higher the chance that participants will get tired or bored.
</label></li>
<li><input name="q4" value="b" id="q4b" type="radio"><label for="q4b">Fewer items means more statistical power to detect an effect.
</label></li>
<li><input name="q4" value="c" id="q4c" type="radio"><label for="q4c">Six is a prime number.
</label></li>
<li><input name="q4" value="d" id="q4d" type="radio"><label for="q4d">More than 40
</label></li>
</ul>
<div id="results"> Check </div>
<div id="alerts"></div>
</div>
</div>
</div>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
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<script type="text/javascript" src="testnav.js"></script>
<script type="text/javascript" src="quiz-spritems.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('li#createstim').addClass('active');
$('li#crit').addClass('active');
});
</script>
</body>
</html>