Researchers at MIT report that they have found what they believe to be the neuronal basis for the sensation of déjà-vu:
In a piece entitled “Insight” I wrote about a similar phenomena:
From early childhood on, and I have occasionally experienced a kind of “reverse déjà vu.” It is the sensation of suddenly staring at a familiar object as though I were seeing it for the very first time, even though it has been in my home for years and may have even been used by me on a daily basis. My overwhelming emotional response in these moments is that I have never really seen the thing before, even though I know I have. This feeling stays with me for a few minutes of rapt fascination, after which the object is “restored” to its former “ordinary” state in my mind.
Here is a link to the entire text: http://www.brownestreet.com/texts/Insight.htm
According to a new study, viagra the brain only chooses to remember memories it thinks are most relevant, and actively suppresses those that are similar but less used, helping to lessen the cognitive load and prevent confusion.
“Whenever you’re engaging in remembering, the brain adapts. It’s constantly re-weighting memories,” says Kuhl. “In this simple test, we see it reverse memory to weaken competing memories. This is something that probably happens a lot in the real world.”
A good example is the confusion that arises when we change passwords on our computers or email accounts. We often mix up old and new passwords at first, but through repetition we develop a strong memory of the new password and forget the old one.
Full text here: http://www.newscientist.com/article/dn11983-forgetfulness-is-a-tool-of-the-brain.html