The brain continues to give up its secrets.

We have a fair idea as to how memories are stored in the brain. But just as interesting is how the brain knows when to start the recording, so to speak. It turns out that there specialised neurons that do just that. They have been called boundary cells and they have been located in the hippocampus. This is the part of the brain largely responsible for forming memories. A small percentage of the neurons there are boundary cells. They fire when new things start to happen. Of course, that is not the whole story. Some new things do not get recorded. But just as boundary cells have been identified, so shall we figure out how the rest of the brain works in the fullness of time.

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