Disagree ko as usual..hehehe..
"I've been here before": the déjà vu feeling
RITA CARTER
MOST PEOPLE – TWO OUT OF THREE according to surveys - have experienced déjà vu. It is that weird sensation of having “been here before” or having “lived this moment already”. You may be talking to a stranger, for instance, and suddenly feel that your conversation is a replay, word for word, of a previous one. Or you may be visiting some entirely unfamiliar town and “realise” that you have been right there, in that precise spot, at some other time, even though you know it is impossible. The feeling goes way beyond any vague sense of having seen or done something similar before – it feels identical to a past experience. Yet trying to pin down the memory is like trying to catch a dream – just as you think you are homing in on it, it turns to vapour.
The eeriness of has led to all sorts of spooky theories. One popular one is that it is evidence of reincarnation – a bit of a past life “breaking through”. Others believe it is the memory of a dream in which the person has lived through the current moment in advance. In recent years, however, neuroscientists have discovered enough about perception and memory to piece together a more plausible explanation.
Every conscious experience we have is “constructed” by our brain out of lots of different components, rather as a car might be made in a factory. We tend to think of an event as a bundle of sensations: sight, sound etc, but there is actually much more to it. If you (literally) bump into someone in the street, for example, you will be aware of the sight of them, the touch of them as you bump, the sound each of you make and so on. But you will also be aware of the meaning, tone and intention of the sound, the pain from the bump, a sense of irritation or embarrassment; a thought, perhaps, that you, or the other person, is clumsy, and so on….. There is much more to experience than simple sensations.
One, very important “component” that often gets added is a sense of familiarity. This is generated in the deep part of the brain that creates emotions. The sense of : “ah yes! I recognise this!” usually only gets attached to experiences which “match” stored memories. Sometimes though, the part of the brain which generates the feeling of familiarity becomes “trigger happy” and attaches the feeling to an experience that is actually quite novel. This is what seems to happen in déjà vu. The brain then tries to dig out matching memories, but of course, they aren’t there – hence the maddening feeling of chasing shadows.
For most people déjà vu is a rare and fleeting phenomenon, intriguing rather than disturbing. And it doesn’t seem to be unhealthy – indeed, déjà vu is most commonly reported by people who are young, intelligent, well-educated and wealthy. Given that it is actually a minor brain malfunction, this may seem strange. The explanation may be that young brains are more “recognition sensitive ”, so they are more easily triggered into familiarity mode. Similar sensitivity may also be a factor in intelligence – bright people “see things” quickly, meaning they get that “ah-ha!” feeling more readily than others. And intelligent people tend to go on to higher education and thus become wealthy. So déjà vu may be a side-effect of having a brain that is quick to recognise things.
For an unfortunate few, though, déjà vu is a constant companion, and a serious blight on their lives. Dr Chris Moulin is a psychologist at Leeds University who is studying this strange disorder. He first came across it when he was working in a memory clinic: “We had a peculiar referral from a man who said there was no point visiting the clinic because he’d already been there, although this would have been impossible. Déjà vu has developed to such an extent that he had stopped watching TV - even the news - because it seemed to be a repeat, He even believed he could hear the same bird singing the same song in the same tree every time he went out.”
Apart from the Groundhog Day tedium of chronic déjà vu, the condition can also get people into social difficulties. “Some patients feel that everyone they meet is familiar and this makes them dangerously trusting of strangers,” says Moulin. “If they don’t constantly remind themselves that the sensation is false they are at risk of being exploited.”
So next time you find yourself “re-living” an experience, don’t struggle to recall the previous time. Just sit back and relax. And make sure that you don’t sign on the dotted line until the moment has passed.
Read other things here:
The Brain Book - Déjà vu