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I'm under the impression that standard cognitive load manipulations (e.g., remember a 7-digit number while completing some other task) wouldn't work for online subject pools like Mechanical Turk. Are there other cognitive load manipulations that might work online? Time pressure is an obvious one, but anything else? Thanks!

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Why do you think the example you mention wouldn't work? If you required them to type in the number after completing the task, and gave them feedback (right or wrong), it wouldn't differ from a lab situation, would it? Personally, we usually use de Neys and Schaeken's (2007) task, which I haven't seen run online, but I'll be programming it up and sharing it myself in the next fortnight, so I'll try and remember to link it here. –  Eoin Jul 7 at 21:41
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I imagine the problem with online experiments is that it is much easier for the subjects to cheat by writing the number down. –  Josh Jul 7 at 22:02
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True. I think there's an art to framing your instructions in such a way that people are motivated to give their honest best effort, but knowing that doesn't really solve your problem. –  Eoin Jul 8 at 8:29

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