Want To Have A Better Memory? Study Shows Sounds During Sleep Can Help

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[Source: Wikipedia]

[Source: Wikipedia]

If you’re not willing to send electrical shocks through your brain – “mild” as they might be – to become smarter, here’s a much gentler option: play sounds while you sleep. Researchers have found that “carefully timed” sounds, like the rise and fall of waves washing against the shore, can help people remember things that they learned the previous day.

I predict sales of white noise machines to increase in the near future.

In the human brain a network of neurons are often activated together. The collective rise and fall of activity of the network produces oscillations, the lines we see in an EEG. At different times the brain oscillates at different frequencies. During sleep the brain produces slow, <1 Hz oscillations – hence the term “slow-wave sleep” – and these oscillations are thought to be important for consolidating memories. The idea that the scientists at the University of Tübingen in Germany wanted to test was whether or not auditory stimulation that boosted the slow-wave oscillations also boosted memory.

The study included 11 people who learned word associations right before they went to bed. Their word assocaition memory was tested before they went to sleep and then again the following day. While they slept, they were played short durations of pink noise, a hissing sound similar to white noise. Importantly, the pink noise sounds were timed to the sleeping person’s “slow-wave” brain oscillations. When the individuals received the pink noise stimulation they were able to remember twice as many word associations than without the stimulation. When they repeated the experiment with pink noise that was not synchronized to the slow-waves, they saw no improvement in memory.

Monitoring the brain waves with EEG, the researchers also saw that the sound stimuli actually boosted the ongoing slow-wave oscillations. This led the researchers to suggest that pink sound stimulation could not only boost memory, but it might also help people sleep better.

Study coauthor Jan Born says his method for boosting memory is much more ethical than electric shocks to the brain. Others tend to agree. [Source: University of Tübingen]

Study coauthor Jan Born says his method for boosting memory is much more ethical than electric shocks to the brain. Others tend to agree. [Source: University of Tübingen]

“The beauty lies in the simplicity to apply auditory stimulation at low intensities,” Jan Born, of the University of Tübingen and coauthor of the study, said in a press release. “An approach that is both practical and ethical, if compared for example with electrical stimulation.”

Others have tried to boost memory by stimulating the brain into synchronized, oscillating activity. Rhythmic electrical, magnetic and sound stimuli had all been previously used but with no effect. The current method worked, the authors suggest, due to the fact that they synchronized their sound stimulation to the natural oscillations of slow-wave sleep simultaneously going on in the brain.

And more than just allowing us to boost our memory while we get a better night’s rest, the authors suggest that similar auditory stimulation might work to enhance other brain rhythms that occur while we’re awake, such as the oscillations involved in regulating attention.

Of course, this only works if you're not distracted by the constant, pulsating sound being played in your ear.

So I have to modify my initial suggestion. You not only have to play sounds, but you have time the sounds with the EEG device you're wearing. But even EEG devices are becoming user-friendly. So much for Mozart For Babies, here's to EEG Hits For Adults.

Peter Murray

Peter Murray was born in Boston in 1973. He earned a PhD in neuroscience at the University of Maryland, Baltimore studying gene expression in the neocortex. Following his dissertation work he spent three years as a post-doctoral fellow at the same university studying brain mechanisms of pain and motor control. He completed a collection of short stories in 2010 and has been writing for Singularity Hub since March 2011.

Discussion — 4 Responses

  • Charles Abrahams April 27, 2013 on 3:08 pm

    It would be really good if there were examples of the sounds used in this research to accompany this article. Personally I’m really interested in trying this methodology out.

    • Facebook - hair.flipper.7 Charles Abrahams December 31, 2013 on 7:48 am

      I totally agree! I doubt that it will hurt us. Fortunately there are apps that you can download to your smart phone to help you sleep. You might be able to find ocean waves but it’s not closed loop.

  • palmytomo April 27, 2013 on 4:58 pm

    I suspect the constant noise over a long time, as a nightly habit, may cause hearing loss. I wouldn’t do it to myself. For memory enhancement I use Luminosity brain exercises online ten minutes a day. It also exercises and develops other mental competencies (attention, problem solving, visual cognition, speed. And I love silence, as I think it reduces stress and enables me to think more clearly.

  • andy_permutation May 1, 2013 on 2:29 pm

    Something very interesting to know, as the sound affects the brain.