PMC has a lot of junk journals. Don't fall for them, especially if you want to use "Dr" in your nick. Most meditation research is rather low quality. Don't go around just googling your confirmation bias. One would not regard any journal on Ayurveda to have much scientific merit. It's essentially quackery. Their standards for peer review are low. This "paper" uses oxymorons such as "Vedic science".
Take this text for instance:
"A feedback loop to the DNA starts a new cycle to provide whatever is needed for the activities of the cell. In meditation, the feedback loop to the deep inner Self (the seat of knowledge, like DNA) provides inner peace and bliss, which removes the accumulated stresses of life and improves overall health."
That gibberish would be an instant reject from any serious reviewer. This is not how science papers are written. This is the snake oil of the meditation world I was talking about. Minus the citations, this qualifies at best as a Facebook post. This might be an example of how meditation makes an educated man talk silly.
I also know several meditators. Anecdotally, not one improved his powers of concentration with meditation. They procrastinate and get distracted like everyone else, all while claiming they feel so much focused after meditation. Maybe, meditation makes them feel focused, while not actually being so.