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Why 'relearning' Tends to be Easier Than Starting 'from Scratch'
They have shown that nerve cell contacts established during a learning process stay even when they are no longer required. The reactivation of this temporarily inactivated 'stock of contacts' allows a faster learning of things forgotten.
In order to learn something, nerve cells make new connections with each other. When faced with an unprecedented piece of information, for which no processing pathway yet exists, filigree appendages begin to grow from the activated nerve cell towards its neighbours.
Whenever a special point of contact, called synapse, forms at the end of the appendage, information can be transferred from one cell to the next - and new information is learned. Once the contact breaks down, we forget what we have learned.
However, what happens when the brain learns something, forgets it after a while and then has to learn it again later?
It is known that "relearning" tends to be easier than starting "from scratch" but researchers wanted to find out if this subtle difference also have its origins in the structure of the nerve cells.
The researchers have shown that there are considerable differences in the number of new cell contacts made - depending on whether a piece of information is new or is being learned second time around.
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