Mind during Yoga-Pics.

Brain goes into theta level during Yoga.

It goes into Delta level for an enlightened Yogi.

This has been done in the case Swami Yogananda and Lobsang Rampa.

Those interested on this subject may read ‘An Autobiography of a Yogin‘ by Swami Yogananda and ‘The  third Eye‘ ‘Cave of the Ancients,’Living with the Lama‘ by Lobsang Rampa.

http://www.scientificamerican.com/article.cfm?id=mind-in-pictures-nov-

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Related:

Autobiography of a Yogi link.

http://books.google.co.in/books?id=xsIi4ePN4hYC&printsec=frontcover&dq=autobiography+of+a+Yogin+by+paramahamsa+Yogananda&hl=en&ei=8M8aTceqNo-nrAfBqNWJDA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDUQ6AEwAA#v=onepage&q&f=false

Rampa’s Books link:

http://books.google.co.in/books?id=XLufAAAAMAAJ&q=inauthor:%22T.+Lobsang+Rampa%22&dq=inauthor:%22T.+Lobsang+Rampa%22&hl=en&ei=cdAaTcXKLMXUrQfr4NXeCw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCYQ6AEwAA