@falcino2011 I agree, that's why I've been regarding it as a no no so far. The practice is e.g. ubiquitous in assessing pain in lab animals using the so-called "grimace score", see e.g. here https://t.co/3mWyG53R5Z or https://t.co/sYJsVY89GI
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The rat grimace scale is discussed here: https://t.co/dQniyMGg4L