" First, you are focusing on something, usually it is a sacred object or an image or something like that, but, second, you also screen out irrelevant information. As you do this, more and more information that normally goes to the orienting parts of your brain doesn't go there. So it keeps trying to give you a sense of yourself,
an orientation of that self in the world, but it no longer has the information upon which to do that.
And if you look at the orientation area, it goes dramatically down in its activity during
the meditation practice. It is mostly yellow and just a little bit of red, compared to what you see in the normal waking state. So this area of the brain becomes much less active. We think this is part of what is associated with somebody losing that sense
of self. They feel at one with God, at one with their spiritual mantra, whatever it is they are looking at."
Dr Andrew Newberg on meditation ( Tibetan )
Site Comment : The
purpose of mantras or focussing on the flame of a candle, or a spot of light is to "empty the mind", "enter the silence" all of which is to deprive your brain of ALL incoming data. This takes for frontal lobe OFFLINE. The parietal lobe is then deactivated.
The parietal tells you where you are in 3 dimensional space and dilienates your body shape and position. When your parietal goes down, you feel as one with the universe and the whole universe is you. This phenomena in combination with others are decribed as
Nirvana ( if you are Hindu ), Awakening ( Buddhist ), Sartori ( Zen ) or being in the presence of God ( Christian ). One has to make sense of this out-of-this-world experience and it depends on your.spiritual
Your anterior cingulate cortex in your frontal lobe is responsible for love, empathy, your will and choosing right from wrong. When the frontal lobe is offline in meditation, it is impossibility
that a meditator can sense the presence of God Who is love.
The above eastern terms describe the peak meditation experience; for more insight into spiritual aspects of these non-dual experiences go to R #02
Watch this video to diffrentiate between meditation types: