We are constantly making new memories, at the same rate as we live them. But most of these will be lost, since they contain information we don’t really care about, like a boring bus trip or walking down the street. But some memories are more important and so remain in our mind, like those of family and friends, and it is a really heartbreaking when due to illnesses like Alzheimer’s disease they disappear.
This new invention is therefore something to hope for. Scientists from Northwestern Univeristy, Chicago, discovered that when they applied a magnetic field on a patient’s brain their memory performance would be boosted. This was investigated in a trial, where two sets of patients were given either this treatment, called TMS for Transcranial Magnetic Stimulation, or a placebo. After, they were provided with images of people’s faces, and when a picture was shown, some words were read aloud. Once this was done, the patients were given a couple of minutes, and then tested to see if they could relate the images to the words they had heard. Those that had been given TMS scored better in the test than those without it.
But how does TMS actually work? Well, it has been known for quite a while that the nervous system works by a series of impulses of electricity. The brain is no different, so if you want to stimulate the brain, you want to apply an electric current to it. This can be done with drugs or surgery, but what makes TMS special is that it is non-invasive, so it doesn’t enter the patient’s body, making the whole procedure easier and somewhat safer. The magnetic field that flows through the brain creates an electric field, which stimulates the brain. If this is done in the right area, it can enhance certain abilities.
To improve memory, the immediate assumption would be to treat the hippocampus with TMS, since this is the area were most of the brain’s work on memory happens. But the hippocampus is too deep in our brains, so the magnetic radiation wouldn’t reach it well enough. Therefore, the researchers decided to work on a more superficial part of the brain that indirectly stimulates the hippocampus. The new electric current flowing through the brain caused memories to last longer, specifically the associative memories (those that link something to something else). However, the effects seemed to last for 24 hours only.
Still, with enough research, TMS could develop into an efficient treatment for memory-loss diseases, but care has to be taken since the brain is very delicate and even the slightest of changes can cause a chain reaction.