Web-based perception experiments
From Phonlab
Revision as of 17:23, 8 February 2018 by Keithjohnson (talk | contribs)
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 kinds of typical experiment:
- 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 three features:
- source 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/blocktest_list.js"></script>
- <script src="js/blocktest_list.js"></script>
- a call to load the experiment when the page is loaded
- <body onload="load('id',false,500,2000);">
- 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.
