The lama who passed away while I was in South India remained in what we call a meditative, post-death state for 15 days, as of last count. This is one of the little known secrets of our tradition.
Following death of the body, a high lama will often use the passage to elevate their consciousness toward higher realms of enlightenment. The death process is an opening for accelerated work toward buddhahood on behalf of all living beings.
At the invitation of His Holiness, neuroscientists have checked the body and brain of the lama and found that his body is, without question, functionally quite dead. No pulse, internal organ activity, or EEG activity in most parts of his brain.
However, the neuroscientists were surprised (closer to stunned) to find that one part of his brain, often associated with higher states of consciousness, was still firing with small signals, many days after bodily death. This is considered to be impossible by Western medical standards.
This is a picture of a another lama who passed away last night, still seated in a meditative posture and state. This photo was taken after his body died. Look into his face and see what you see.
His body will remain undisturbed until he is ready to move on. The monks around him will safeguard this passage