I don't know by experience but I think it has to do with the head.
In the older forums there was a technique posted where you would vibrate
SATANAMA and focus on the 3rd with the consonant
Then 6th chakra and then 7th with the A(s)
Example SSSS (3rd eye)
AAA(6th)
AAA(7th)
TTTT(3rd eye)
etc.
Also Lydia said that it helps her remain VOID when chanting SATANAMA
in her mind.
Which makes me remember that HP Mageson666 recommended
chanting AUM to stop the chitta(mental stream)/achieve a VOID state.
AUM is a mantra for the 6th chakra so I guess there's a link 'tween all this.