Difference between revisions of "Web-based perception experiments"
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An example is here: [http://linguistics.berkeley.edu/~kjohnson/talkers/memory.php?list=test example experiment] |
An example is here: [http://linguistics.berkeley.edu/~kjohnson/talkers/memory.php?list=test example experiment] |
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| − | A Javascript library [http://linguistics.berkeley.edu/~kjohnson/talkers/js/audexp.js audexp.js] makes it realatively easy to implement the following four kinds of |
+ | A Javascript library [http://linguistics.berkeley.edu/~kjohnson/talkers/js/audexp.js audexp.js] makes it realatively easy to implement the following four typical kinds of experiments: |
* Identification (id) - a single audio file is played, and a two-alternative forced choice (2AFC) is given. |
* Identification (id) - a single audio file is played, and a two-alternative forced choice (2AFC) is given. |
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Revision as of 18:52, 8 February 2018
Experiments can be hosted on the Department of Linguistics server, and then distributed to listeners by email link, or via Amazon Mechanical Turk.
An example is here: example experiment
A Javascript library audexp.js makes it realatively easy to implement the following four typical kinds of experiments:
- Identification (id) - a single audio file is played, and a two-alternative forced choice (2AFC) is given.
- Discrimination (ax) - two audio files are played, and a 2AFC is given.
- Rating (r) - a single audio file is played, and a rating number (from 1 to 7) is given.
- Contrast Rating (cr) - two audio files are played, and a rating number is given.
Your html code must have four features:
- (1) after loading audexp.js, load a javascript file that defines
- an array (or two arrays) of filenames that will be presented.
- a variable called 'block'
- here's an example of such a file
- this .js file was created with a small perl script from a .csv spreadsheet.
- the html header contains these two lines to get the audexp.js library and the experiment-specific list of sound files.
<script src="js/audexp.js"></script> <script src="js/blocktest_list.js"></script>
- (2) a call to load the experiment when the page is loaded
- this call specifies the type of experiment (in this case 'id')
- whether to randomize the order of presentation of the list of sound files
- the interstimulus interval for 'ax' and 'cr' types
- and the intertrial interval for all experiments.
<body onload="load('id',false,500,2000);">
- (3) Three or for <span...> elements that will be used to give feedback to listeners.
<span id="wr"></span> is used to show warnings <span id="f1">sound 1</span> is used to indicate that an audio file is playing <span id="f2">sound 2</span> is used to indicate that an audio file is playing <span id="key">#</span> is used to indicate which key the listener pressed
- (4) A <form ...> element named "dataform"
- the order of the input items determines the column order in the output file>
<form method="POST" id="dataform" action="process.php?p=id&n=1">
<input type="hidden" name="subject" value=<?php echo $subj; ?> />
<input type="hidden" name="trial" />
<input type="hidden" name="list" />
<input type="hidden" name="file1" />
<input type="hidden" name="filedur" />
<input type="hidden" name="mystatus" />
<input type="hidden" name="loadtime" />
<input type="hidden" name="response" />
<input type="hidden" name="rt" />
</form>
Finally, in (4) above you may have noticed there was reference to a file: process.php.
process.php
