I work in mental health and it has long been recognised that it is not at all recommended for those who dissociate. Those suffering trauma may well be more likely to turn to meditation as a natural remedy but it can bring up traumatic experiences before people are ready. I prefer mindfulness......you can do it with your eyes open and stay grounded in the present.

Just at a quick glance through the paper the question is loaded with a bias toward negative experience. A more effective question would be to rate from 1-5 on a Likert scale unpleasant to pleasant experience.

I also don’t see any accommodation for those participants who may be taking medications and what the medications may be as this could create a psychopathological intervention.