There have been several medical doctors and scientists who have tried to
explain away the near death experience accounts of those who have been
resuscitated from clinical death [ i.e. no EEG or Electroencephalograph
brainwave activity, and no EKG/ECG or electrocardiograph heartbeat
activity ], as the result of string theory, photons, and quantum mechanics,
and therefore not as a result of supernatural or divine intervention, but I
am not convinced by this. For example, see Even if near death experiences
were an example of string theory and quantum theory in operation, this does
not necessarily have to mean that God does not exist. I also have heard that
one day scientists might discover in particle accelerators with sufficient
energy and speed subatomic particles called tachyons which can travel faster
than the speed - of - light, but even if this proves to be the case, I do
not see why this would necessarily rule out the existence of God. Jesus
Christ did say according to the Gospel of St. Mark, chapter ten, verse
twenty seven, that nothing is impossible with God. For all its worth, I have
decided to include a few web site links that explore the scientific
explanations offered for near death experiences. Here they are:

How could God be Omnipresent - A Scientific Explanation, by Frank Lee, in
http://www.web-books.com/GoodPost/Articles/Omnipresence.htm

The String Theory and the Resurrection of the Dead, by Frank Lee, in
http://www.web-books.com/GoodPost/Articles/Resurrection.htm

String Theory, in http://www.web-books.com/eLibrary/PhyString.htm

Looking for extra dimensions. Kaluza-Klein compactification,

in http://superstringtheory.com/experm/exper51.html

The Near Death Experience and the Resurrection of the Dead,

by Frank Lee, in http://www.web-books.com/GoodPost/Articles/NearDeath.htm

Dutch NDE Study Attracts Worldwide Attention by Jeffrey Long, MD & Paul
Bernstein, PhD, concerning the research of the Dutch cardiologist Pim van
Lommel, MD, in http://www.mikepettigrew.com/afterlife/html/dutch_study.html

Dead But Awake : Is It Possible?, by Daithi O hAnluain, in
http://www.wired.com/news/medtech/0,1286,55826,00.html

Consciousness Based on Wireless?, by Jeffrey Benner, concerning the
scientific theory for near death experiences as put forward by Johnjoe
McFadden, Professor of molecular genetics at the University of Surrey in
Great Britain, in http://www.wired.com/news/technology/0,1282,52674,00.html

What is Quantum Physics?, in
http://library.thinkquest.org/3487/qp.html?tqskip1=1&tqtime=1024

For the purpose of life reviews in near death experiences, see Impact of the
Near-Death Experience on Grief and Loss, by Bruce Horacek, Ph.D. and by
IANDS, in http://www.iands.org/grief_and_loss.html

During near death experience life reviews, survivors who have been
resuscitated have reported experiencing the feelings of the people they hurt
one way or another throughout life, and viewing their actions through the
eyes of their victims. Some Protestants might argue that this is Satan's
trick to delude people into believing that purgatory exists, but they would
forget that Satan tries to tempt people into going to eternal hell, and not
in saving their souls by means of purgatory. Satan would not try to dissuade
people from going to hell by means of a purgatorial life review, which gives
those near death experience survivors who had such a review feelings of
empathy for their victims. If purgatory does not exist, then it could be
argued that convicted criminals should not be imprisoned or punished in any
other way if they sincerely repent. Consciousness does continue after death.
For example, this is what Revelation 6:9-11 says:

9 When He opened the fifth seal, I saw under the altar the souls of those
who had been slain for the word of God and for the testimony which they
held.

10 And they cried with a loud voice, saying, "How long, O Lord, holy and
true, until You judge and avenge our blood on those who dwell on the earth?"

11 Then a white robe was given to each of them; and it was said to them that
they should rest a little while longer, until both the number of their
fellow servants and their brethren, who would be killed as they were, was
completed.

For Biblical references for the existence of purgatory, see these references
from The New King James Version of the Bible:

The Acts of the Apostles ch.2:22-36, Matthew 27:50-54, The Gospel of St.
John 20: 19-23, I Peter 2:5, I Peter 2:9-10, Matthew 18:15-35, Matthew
16:13-19, The Gospel of St. John 21:15-19, Luke 22:31-32, The Epistle of St.
Paul to Titus, chapter one, Matthew 6:14-15, Luke 17:3-4, Matthew 5:25-26,
Luke 12:58-59, Revelation 8:5, I Corinthians 3:10-15, Mark 9:49, Luke
12:47-50, Luke 3:16-17, II Peter 3:8-13, Mark 10:25-27, Matthew 13:10-17,
Colossians 3:25, Psalm 50:16-23, Romans 10:6-7, I Corinthians 15:55-56,
Revelation 9:1-12, Revelation 19:19-21, Revelation chapter 20, The Epistle
of St. Jude, verses 6-9, Revelation 12:7-9, The Epistle to the Hebrews
ch.12:5-11.