1.   A preliminary autopsy found no heart or brain malfunction, or condition that would have caused her to die so quickly.

2.   One factor may be a brain malfunction.

3.   The big task before researchers is to find the cause of the brain malfunction.

4.   Stevenson and Greyson say most of their colleagues in medicine believe such experiences are hallucinations produced either by drugs, metabolic disturbances or brain malfunctions.