Dear DavidStone,
I'm glad we are both in agreement that hyperventilating isn't optimal, and breath holding can be beneficial.
I would venture to say that when one goes deep into their mediation and the emptiness, that a natural pause or non exhale/inhale happens. Of course it would need to be monitored by a machine, since as soon as you would bring attention to it, the subject/your breath would change.
Much Love,
Shawn
