This is a re-post from The Singularity Hub's article (link to original).

If you do a lot of research like I do, sometimes it's a bit difficult remembering everything that you've studied the previous day. Science is showing that listening to sounds during sleep (background noise, white-noise, ambient sounds) can help memory! Good deal! :)

Here's the article Written By: Peter Murray
Posted: 04/27/13 5:54 AM

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

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Comment by PuzzleSolver on May 18, 2013 at 9:20am

Here's the Pink Noise that was mentioned up there..

Paul Lee this might help your meditation, it says "Tinnitus relief" might work?

I don't know about most people but I find this rather soothing. I actually think that I could use this during meditation. Capt., noiseless would be preferred method of meditation but we see that we're not in a noise free world, I think you mentioned (in chat) your in a big city so you know what I mean.. We find that we literally have to incorporate all those sounds into our meditation like the ticking of a clock, a car passing or construction sites, If these ambient like sounds can fill in that surrounding noise gap and increase the positive outcome of meditation that would be greatly beneficial!

Comment by Capt. Anand Kumar on May 18, 2013 at 8:40am

Brilliant post PS. One wonders if the traditional meditation technique which requires (or prefers) a noise free environment to aid concentration will fit into this. Meditation is believed to increase the memory retention capabilities as well.

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