Past lives reincarnation is a theory dictated by the Hindu philosophy of athma, or soul, and karma, or deeds. With this, the soul goes through past lives reincarnation and other births, because it is indestructible and cannot be destroyed. Instead, it only changes form from one life to the next, much as you might change outfits once one has outlived its usefulness.

This differs greatly from Christianity, which has as its focus Christ's resurrection. The Hindus state that the soul can take any form, whether man, woman or animal. The deeds one does in one's present life, or karma, will dictate what happens to someone in the next life.

Several Hindu scriptures talk very much about past lives reincarnation. Most notable among these is the Bhrigu Sanhita. This scripture apparently had a complete accounting of the future and past births of all souls living; it's unfortunate, then, that the scripture has been lost to the ages.

A proponent of modern rebirth has been Dr. Ian Stevenson, who has collected much information on this subject. Science in general still frowns on the concept of rebirth as valid, so it can't be said that modern science supports this collection of 'scientific information' on reincarnation theory. Nonetheless, Stevenson's work is the most famous and well documented, not least because Dr. Stevenson was a psychiatrist with a degree in medicine.

Dr. Stevenson didn't put patients under trances or into hypnotic states, however, as many modern day past life regression therapists do. Instead, he simply interviewed children who spontaneously recalled things they had experienced in past lives.

Most noted and perplexing among these cases was that of a small child, a boy, six years old, from a small village in Punjab. This child claimed that he had been a man named Satnam Singh; further, he could vividly describe the man's village of Chakkchela, even though the boy had never actually been there.

The family tried to dissuade the boy from telling people about this, but he continued to claim that he was Satnam; he also gave the name of this man's father. He also said that he had been killed in his past life as he was coming home from school in a motorcycle accident. The boy's claims were investigated and were indeed found to be true, insofar that a man by that name had indeed been killed in a motorcycle accident on the way home from school. The boy was also able to give intimate family details, and these, too, proved to be accurate. What was most notable, though, was that when the man's and the boy's handwriting samples were compared, they were found to be identical.

Stevenson also interviewed a young girl named Swarnalata, another of his famous cases. This young girl was just three years old, but she remembered her past life as a young woman named Biya Pathak. The little girl could describe the house that she lived in, and even took her father there one day when they were coming back from the railway station in their town. She further said that she and her father could get a better cup of tea in Biya Pathak's house than they could on the road. Again, the final proof turned out to be when the child recognized the young woman's brother, and addressed him by a pet name the young woman had had for him, among a group of nine people.

Stevenson's files listed dozens of these types of cases. Further, Stevenson states that when injury happens in one life, it can manifest in the next as a birthmark in the same location as the injury. This was indeed borne out in one of his cases on a man from Thailand, who recalled that he was in fact his own deceased maternal uncle, reincarnated. This man had a scar on his head that matched the location where his maternal uncle had been wounded with a knife and had died as a result.

Another young boy claimed to remember a past life as a man named MahaRam. This man had been killed by close contact gunfire to the chest, and the boy had several birthmarks on his chest that looked like gunshot wound scars.

Many psychiatrists and other eminent authorities in psychology and psychiatry believe in rebirth as a legitimate concept, including Dr. Brian Weiss, who is considered to be the father of past life regression. However, science continues to be very skeptical about it. Nonetheless, it's also worth noting that when many people undergo a few sessions of past life regression therapy, they experience the sudden disappearance of phobias and fears they've had their entire lives.