Another article not written to me but sent in by Mark Davis.
In 1961 British archaeologist turned parapsychologist Thomas Charles Lethbridge came up with the concept of stone tape to explain ghosts, he said that ghosts are not the disembodied dead but emotions left by the dead and living, embedded into the surrounding environment as in the walls of a building or into the furniture in a room or even in a tree . With recent advances in quantum field theory Lethbridge’s idea has gained some credibility. So, how might such a phenomena work in the real world? When we experience an emotion it is caused by electromagnetic stimulation of various parts of the brain, causing a cascade of neural transmitter chemicals to be released. Could some of this electromagnetic signal in some way embed into surrounding objects and then in a sense replay it’s self when an observer is present, the majority of objections to this scenario are based on how such embedded information could find enough energy to replay itself. This problem can be solved by the use of ambient energy usually in the form of heat in the air and general environment and if this is the case it would explain why a room suddenly goes cold just before ghost like phenomena occur. Also the act of observation by a conscious observer has profound effects on quantum systems causing the wave function of such a system to collapse. And we must also consider if the observer has ever experienced similar emotions to the ones embedded if so then we may have some sort of sympathetic interaction between the two and indeed could explain why some people see ghosts and not others. Lots of research is going on into quantum computing at the moment and this is just what is needed in this case low energy quantum state information storage and retrieval could once and for all solve this age old question.