The meditation you find underneath is a legacy from whise people who lived and experimented in those times. This meditation is a way they found to counter the depression and disconnectedness that hit civilisation.
The brain has a rhythm. The two hemispheres alternate which one is dominant at any one time. You can feel which of the hemispheres is dominant by sensing which nostril is more active. The left nostril is connected to the right part and the right one to the left part of our brain. When the nostrils equalize before theshift we reach an important point of synchronization. Normally these shifts occure throughout the day. But if a deep fear is activated by one side we can get out of rhythm. This gives us a feeling of disconnection or being driven by emotion. This meditation is like a wake-up call allerting the mind before it loses its ability to function in an emotional 'limbic' loop.
The hand and eye position need to be exact and steady through the 11 min.
Sat Nam, Anne