Yes, I learned that from no-equipment divers. With this simple trick people can look around down there with just a mask and fin. They claim with practice the mental effect disappears.
Don't hyperventilate before diving (or at all, really). It doesn't oxygenate blood more than ordinary breathing but it does confuse the breathing reflex allowing you to overextend yourself and possibly drown.
This thread is for:
- Perfectly natural and functional ideas that came from a spiritual, religious, occultist, parapsychologist etc. source (perhaps with some "baggage")
- Techniques that are bit difficult to explain and may be seen by the gullible as magic, but they actually seem to do something, even if that something is just a novel way to trick the brain.
Both things that are actually useful and "stage tricks" are accepted in this thread.