The slow fluctuations in brain activity that occur during so-called non-REM sleep are critical to the retention of memories.. Researchers have found that playing sounds in rhythm with the slow vibrations of a sleeping person's brain amplifies those vibrations and enhances memory.. This demonstrates a simple and non-invasive way to influence the functioning of the human brain, which will help improve sleep and memory..

Dr. Jan Born from the University of Tubingen in Germany, co-author of the study, says the beauty of the approach lies in the ease of applying sound stimulation at low intensity, as it is both practical and ethical compared to, for example, electrical stimulation, and therefore a simple tool for. net Dr. Born and his colleagues conducted a study involving 11 people who were exposed to sound stimulation at night, synchronous with brain fluctuations in non-REM sleep or sham stimulation. When volunteers were exposed to stimulating sounds synchronized with slow brainwaves, they better remembered the word associations they had learned the night before.. Sound stimulation not in the rhythm of brain oscillations in the non-REM sleep phase was ineffective. Dr. Bourne explains that sound stimulation can only be effective when the sounds are in sync with the ongoing slow rhythm of the brain during deep sleep..

The researchers believe this approach could also be used to improve overall sleep.. Moreover, it can also be used to process the brain with other rhythms with clear functional significance, such as brainwave oscillation rhythms that occur during wakefulness and are involved in the regulation of attention..

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