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Published on: April 20, 2019
by Aristos Georgiou for Newsweek:
Electromagnetic brain stimulation of an area of the brain known as the hippocampus has improved the memory of older adults with age-related memory loss, in a study published in the journal Neurology.
Researchers from Northwestern University Feinberg School of Medicine used a noninvasive technique known as transcranial magnetic stimulation (TMS) to target the hippocampus—an area of the brain that degenerates as people age, leading to memory loss—with a powerful electromagnet that generates electrical activity.
“Everyone experiences memory decline with age,” Joel Voss, lead author of the study from Northwestern said. “My laboratory has been working on ways to improve memory ability using noninvasive stimulation for a number of years, and so we tested for the first time whether the methods we’ve developed work in older adults experiencing memory decline.”
“[The hippocampus] is the part of the brain that links two unrelated things together into a memory, like the place you left your keys or your new neighbor’s name,” Voss said in a statement. “Older adults often complain about having trouble with this.”
The hippocampus is actually too deep into the brain to stimulate directly with TMS, so instead the team targeted an adjacent brain region, closer to the surface of the skull, that has strong connections to it.
“We stimulated where brain activity is synchronized to the hippocampus, suggesting that these regions talk to each other,” Aneesha Nilakantan, first author of the study, said in the statement.
Before the stimulation took place, the researchers gave younger and older adults a memory task. The older adults—who ranged between ages 64 and 80—scored around 40 percent on this, whereas the young adults in their 20s and 30s managed about 55 percent.
Then, the older adults were given five consecutive days of TMS for durations of 20 minutes each session.
“During a stimulation session, individuals sit in a chair while a technician aims the transcranial magnetic stimulation device at the targeted brain area,” Voss said. “The stimulator looks sort of like a high-tech vacuum cleaner attachment wand that is held up against the head. The stimulation feels like a slight tapping sensation and produces a clicking sound.”
Functional magnetic resonance imaging (fMRI) showed that these sessions improved the activity of certain brain regions important for memory that were damaged by aging.
Finally, one day after the final stimulation session, the older participants were given a new memory test—in which they scored similarly to the young adults, suggesting that one form of memory ability had been improved, at least temporarily. It is important to note, however, that the study only involved a small sample of 16 people, so the findings should be viewed with caution.
“We were able to increase brain activity in exactly the areas of the hippocampal network that we targeted, and this improved memory ability in older adults,” Voss said. “Unsurprisingly, older adults started off performing the memory task worse than younger adults in their 20s and 30s—performing the same task.”
“After stimulation, memory improved such that older adults were no longer impaired relative to younger adults,” he said. “The memory task assessed people’s ability to remember where objects are located and in what types of places. This is the type of memory that declines the most with aging and the type of memory that specifically was improved due to stimulation in our study.”
Voss said that this memory boost was measured a full day after older adults stopped receiving stimulation, and lingered in reduced form for up to a week later. Future studies will be able to determine if tweaking the stimulation parameters will produce longer-lasting improvements.
“There is no previous evidence that the specific memory impairments and brain dysfunction seen in older adults can be rescued using brain stimulation or any other method,” he added.
The next step, the researchers say, is to test the technique on people with mild cognitive impairments, such as those suffering from the early stages of Alzheimer’s, and to refine the methods with the aim of producing more “robust and longer-lasting affects,” Voss said.
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