Amazon Mechanical Turk
Relevant Papers
Conducting behavioral research on Amazon’s Mechanical Turk by Winter Mason & Siddharth Suri should be a standard reading for anyone conducting mturk experiments in the lab.
Example MTurk Experiments
Self paced reading (run with modified IBex)
- an example of spoken recording as soon as we have it
Standard Practices
Always include the following text near where you link to the consent form:
Sometimes it can happen that technical difficulties cause experimental scripts to freeze so that you will not be able to submit a HIT. We are trying our best to avoid these problems. Should they nevertheless occur, we urge you to contact us.
Tips
Audio
If you intend to play audio, keep in mind that not all browsers support the same formats within the <audio> tag. Make sure to provide multiple <source> tags within your <audio> block, in the order you'd prefer the browser choose them, e.g.
<audio>
<source src="foo.m4a" type="audio/mp4" />
<source src="foo.ogg" type="audio/ogg" />
<source src="foo.mp3" type="audio/mpeg" />
<source src="foo.wav" type="audio/wav" />
Your browser does not support the audio element.
</audio>
Use as many or few as you need to get full coverage, or at least coverage for all the browsers you care about.
Here is a table of current levels of support in the major browsers:
|
m4a |
mp3 |
ogg |
wav |
IE9 |
no |
yes |
no |
no |
Opera 11 |
no |
no |
yes |
yes |
Firefox 13 |
no |
no |
yes |
yes |
Chrome 20 |
yes |
yes |
yes |
yes |
Safari 5.1 |
yes |
yes |
no |
yes |
To convert a wav to mp3:
lame --resample 22.05 -b 64 foo.wav foo.mp3
To convert a wav to m4a:
ffmpeg -y -i foo.wav -acodec libfaac -ab 64k foo.m4a
To convert a wav to ogg:
ffmpeg -i foo.wav -acodec libvorbis -ab 64k foo.ogg
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