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Tutorial: Creating a 2-Alternative Forced Choice Experiment using ETK: the Evaluation Toolkit

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• Design your experiment and create stimuli images

• Trivial example included in ETK: 2AFC to determine discrimination threshold for “grey” not black

ETK homepage: etklab.org GitHub: github.com/ascr- ecx/etk

ETK homepage: etklab.org GitHub: github.com/ascr- ecx/etk

Tutorial: Creating a 2-Alternative Forced Choice

Experiment using ETK : the Evaluation Toolkit

(2)

Create a Qualtrics survey; insert the ETK JavaScript, HTML & CSS

files; modify as needed to point to

array of your stimuli images

(3)

Create output variables

(4)

Now we are ready to preview the survey!

Study screenshot: Can you tell which is the darker image?

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https://www.mturk.com/mturk/welcome https://www.mturk.com/mturk/welcome

Run the study in the lab or

crowdsource

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