The simplest explanation is that OBEs are exactly what they seem: the human consciousness separating from the human body and traveling in a discorporate form in the physical world. Another idea is that they are hallucinations, but this requires an explanation of why so many people have the same delusion. Some of our experiments have led us to consider the OBE as a natural phenomenon arising out of normal brain processes. Thus, we believe that the OBE is a mental event that happens to healthy people.