A post I posted over at my "Geekanology" website:
In my opinion it is ludicrous to believe in things like ghosts, they are last bastion of those reaching out to something they suppose (wrongly I think) will take them beyond life's clutches. Ghosts/spirits are, and please correct me if I'm wrong, the "real essences" of people and animals (usually dead). They continue to exist after we die and are a separate though (crucially) important part of our psyche ... in other words in the event of death (no matter how horrible) that person's spirit is released into the ether for a gay little life of its own. So one might reasonably expect a person's character to remain fairly consistent throughout their life ... yet curiously, in the event of an accident involving head trauma or an illness involving brain damage a persons intelligence, personality, thought and abilities almost always change to some degree (sometimes quite devastatingly as I shall show in a moment).
Although it is not possible (or rather not considered good practice, LOL) to slice people's brains up and see how their behaviour changes the victims of many, many road accidents and war injuries have been carefully studied and our knowledge of the relationship between mind and brain is not as lacking as some would claim. Indeed there were, last time I looked, maybe a thousand serious science journals devoted to the subject of mind and brain and it strikes me that that many journals means a lot of associated workers in the field. We may not fully grasp it all yet but I think know more than some would have us believe ... a quick search on Amazon UK for "brain mind" reveals some 1200 books, I'm sure there's crap there but that's still a lot of books to publish about which some will naively claim we know so little.
To give a personal example an uncle of mine (who died about 20 years ago) was the most charming man and an absolutely doting and devoted husband but, at the age of about 60, had a stroke and became the most vicious, nasty individual ... he absolutely tormented his wife. There is no doubt in my mind that the latter him was real and so was the former him but the problem is that if ghosts are real which *him* goes on to this supposed afterlife? How can this be if these *ghosts* are real? To claim that only his good part went to this afterlife is insulting on every level (including intellectually) because if his good part was in him for the remaining decade or so he survived after the stroke (when he was nasty) it would have been screaming itself into a state of insanity trying to get out.
That and many other examples leads me to the conclusion that those who believe in life after death (of any sort) do so on faith and faith alone because there is absolutely no validatable evidence to support such beliefs. As Dawkins would say, they, "... do it without any evidence and sometimes in spite of it".
Now scepticism is all well and good but that still leaves the problem of explain such things and there are two explanations equally valid and both probably in various situations.
Mistaken Identity i.e. it looks like a ghost, sounds like a ghost therefore it must be a ghost.
A friend of mine went round with some colleagues to a neighbours' house to investigate a claimed haunting ... every night at the same time there was terrible groaning & moaning and a ghostly figure would appear on the landing and walk across it. My friend and his team investigated and it turned out the explanation was as follows ... there were old dust covered pipes above the landing and every night at that time the central heating would come on, pipes would expand and begin to vibrate with the water flowing through them and this caused the groaning/moaning sounds. At the same time the shaking pipes would shed some of the dust that lay upon them and it would fall to the landing floor but passed through a ray of light from a street light shining from outside the house and form the angle people would view the "apparition" would appear to resemble for a few seconds a ghostly female figure. So the explanation for the event was entirely natural and this is just one of many similar explanations where the cause of a claimed phenomenon turned out to be something else.
All In The Mind i.e. you can see it but no one else can.
The following is an interesting idea which, to my mind, completely explains most, if not all, supernatural events.When you look at something you assume that something is external to you but, because everything you perceive is merely data that has already entered your brain, what you perceive as external is actually a neurologically constructed model inside your brain of the real world outside your brain. This has to be so because your eyes, your ears, your skin, your tongue and so on are not intelligent enough to sense AND interpret things directly so the brain must perform the interpretation function. The key point is you NEVER perceive the external world directly you only ever perceive second-hand "messages" from where it was processed into the three-dimensional model of the real world that you “see”. The things that you perceive as being the genuine articles "out there" are actually simulations of them inside your brain.
So you interact with the real world through a simulation and as long as that simulation is an exact analogy of the real world you do not experience problems. However when that internal model falls out of sync with the real world you begin to experience problems and paranormal, insane or non-sober experiences result ... one only has to drink three or 4 beers to get a good idea of what this can be like.
Since the internal model is a construct it is obvious that other brain (possibly abnormal) activities can interfere with that model ... for example if the neurological program that places the “virtual” you in one location in the model places you in a different location in error an out-of-body experience might result. If your imagination intrudes upon your "real-world" model you might have hallucinations with consequences varying form mildly entertaining, through spiritual to total insanity.
“The location of your consciousness could appear to expand and engulf the entire world-model, resulting in a "cosmic consciousness" experience. Or, inside your brain's program, experiences like pain could be placed in a location outside your simulated body, such as in the perceived location an amputated leg used to be, resulting in a "phantom pain" apparently outside your body. In each example, only the parameters of a simulated body inside the brain are transcended, and thus the evidence of a spirit body disappears like a ghost.” Ian Williams Goddard, 1999
In essence this idea easily explains how such paranormal experiences occur.
Oh and for those of you who are fans of the current cult of TV ghost reality and spiritual medium shows it's worth pointing out that any TV show (Derek Acorah's especially) is not the place where objective events are demonstrated ... they are out to make money and the people who believe their rubbish are being taken for a ride.
"Science, Just Science" (A UK Based Education Campaign)
"Geekanology" (My Other Defining Characteristic)