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Effects of hippocampal noninvasive theta-burst stimulation on consolidation of associative memory in healthy older adults

Popa, T.; Beanato, E.; Wessel, M. J.; Menoud, P.; Windel, F.; Vassiliadis, P.; Violante, I. R.; Alania, K.; Dzialecka, P.; Grossman, N.; Neufeld, E.; Hummel, F. C.

2023-10-13 neuroscience
10.1101/2023.10.11.554933 bioRxiv
Show abstract

Stimulation of deep brain areas can offer benefits against cognitive impairments associated with aging. So far, this was only possible via invasive methods accompanied by risks. Grossman et al. proposed a new noninvasive stimulation technique, transcranial temporal interference electric stimulation (tTIS), which can be steered to target and modulate activity of deep brain structures. Memory capacity depends on subcortical structures such as the hippocampus, hence, modulation of hippocampal activity could benefit declining cognitive functions. The current study investigates whether theta-burst patterned tTIS targeting the hippocampus influences performance of associative memory in older adults. We found that theta-burst patterned tTIS, but not the control stimulation, improved recollection time in a follow-up 24h after the stimulation, suggesting that theta-burst patterned tTIS can influence the efficiency of longer-term encoding. This outcome indicates that tTIS may provide a new noninvasive deep brain stimulation method to modulate senescent memory processes.

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