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How to measure if participants are keeping their head straight: Mantra?

Hello all,

For an experiment in Open Sesame, I need to ensure that participants keep their head straight (that is, not tilt it to the left or right, forward or backward is okay), because a tilted head could influence the visual bias I'm trying to measure. What would be the easiest way to do this in Open Sesame? AFAIK, standard eye-trackers don't output the location of the eyes themselves (they output the location of what a subject is looking at), but I might be wrong. I was told that Mantra is a tool that could do this, but I don't know how to integrate it within Open Sesame.

Thanks very much in advance,

Jasper de Waard

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